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A KVM switch rated for 4K lets two or more computers share one monitor, keyboard and mouse — and that "4K" badge is the least useful number on the box. What decides whether a switch works on your desk is the refresh rate it can carry 4K at, the colour depth of that signal, and whether it negotiates Display Stream Compression (DSC) to get there.
The market has split into three classes that most roundups collapse into one. Conventional 4K60 office switches run DisplayPort 1.2 with no compression and no display persistence. Modern high-refresh switches use DisplayPort 1.4 or HDMI 2.1 with DSC, persistent monitor emulation and hotkey control. Laptop KVM-dock hybrids route video, USB and charging down a single USB-C cable, which forces a lane trade-off the spec sheet rarely spells out. A 4K60 business KVM and a 4K144 gaming KVM are not interchangeable, and a laptop KVM dock advertising 4K144 may cut its USB hub to USB 2.0 bandwidth to get there.
That is why the picks below are ranked by topology and signal behaviour rather than by headline resolution. Before them, a note on the three things vendors describe loosely: DSC versus chroma subsampling, "EDID support" versus EDID emulation, and the cable count nobody budgets for.
If you want the wider field first, the complete KVM buying guide covers the category from 1080p office switches upward, and in practice a 4K high-refresh desk splits cleanly into the single-monitor, dual-monitor and laptop-dock cases handled below.
Quick Picks
| # | Product | Best for | Video interface & top modes | EDID behaviour |
|---|---|---|---|---|
| 1 | TESmart DKS202-M24 | Dual DisplayPort 4K144 desks that must keep window layout | DP 1.4; dual 4K144/165 via DSC 1.2a; 4K240 DSC per output | Persistent Smart EDID emulation |
| 2 | TESmart HKS202-M24-V2 | Dual HDMI 2.1 gaming and creator desks | HDMI 2.1 48 Gbps; 4K144 8-bit; 8K60 and 4K120 12-bit via DSC | Persistent EDID, no window reset |
| 3 | Cable Matters 202070 | Cheapest single-monitor 4K144+ DisplayPort desk | DP 1.4; 8K60 / 4K240 with DSC | None — display disconnects on switch |
| 4 | TESmart HKS401-M23 | Four computers, one premium HDMI monitor | HDMI 2.1 48 Gbps; 4K144 8-bit; 8K60 DSC | EDID emulator on each input |
| 5 | UGREEN 55851 | Budget dual-DisplayPort high bandwidth | DP 1.4; advertises 8K60 / 4K240 | None |
| 6 | Level1Techs DP 1.4 KVM (Dual Monitor) | Demanding DP chains and high-refresh experimentation | DP 1.4; 4K120 / 8K30 official per path; DSC passthrough | EDID handling only, no monitor emulation |
| 7 | ATEN US3311 Duo Flex | Single-cable laptop desks needing 4K144 | USB-C DP 1.4 Alt Mode; 4K144, 8K with qualifying hosts | Video DynaSync display management |
| 8 | StarTech P2DD46A2-KVM-SWITCH | Business, TAA and dual 4K60 | DP 1.2; dual 4K60; 2560×1440@144 | USB emulation, not monitor EDID persistence |
| 9 | Sabrent USB-KCPD | Two USB-C laptops, one 4K60 screen, both charged | USB-C DP Alt Mode → HDMI 2.0, 4K60 | Not documented |
| 10 | MT-VIKI MT-KH802 | Cheapest HDMI 2.1-class entry point | HDMI 2.1-class; advertises 8K60 / 4K144 | Not documented |
What Makes a Great 4K KVM Switch?
The signal, not the resolution. Four modes are sold as "4K" and they need completely different hardware:
| Mode | What the link must carry | Which switch class delivers it |
|---|---|---|
| 4K60 8-bit 4:4:4 | ~12.5 Gbps including overhead — fits DisplayPort 1.2 (21.6 Gbps raw) or HDMI 2.0 (18 Gbps) | Conventional 4K60 KVM |
| 4K120 / 4K144 8-bit | DP 1.4 HBR3 (32.4 Gbps raw, 25.92 Gbps payload) or HDMI 2.1 FRL (48 Gbps) | DP 1.4 and HDMI 2.1 high-refresh KVM |
| 4K120 12-bit HDR over HDMI | DSC on an HDMI 2.1 link | TESmart HKS202/HKS401 class |
| 4K240 / 8K60 | DSC over DP 1.4, plus matching GPU, KVM, monitor, firmware and cable chain | Top of the DP 1.4 class |
Compression sits behind the largest modes, and the two mechanisms get confused constantly. DSC is a VESA low-latency, visually lossless compression method that typically fits roughly 3:1 more display into the same bandwidth; a 4K144 DSC link can still carry full RGB 4:4:4 if the negotiated mode allows it. Chroma subsampling (4:2:0) throws away colour resolution instead. They are separate tools, and a switch carrying 4K240 almost certainly means a compressed link rather than a subsampled one.
EDID behaviour is the decision most buyers should actually make. Three levels exist, and vendors use the same words for all three. A hard switch with no EDID management shows the inactive computer a disconnected monitor, so windows rearrange on every switch. A switch that handles EDID parses, relays or re-keys it for HDCP without pretending the monitor is still attached — that is Level1Techs' position exactly, and its own product page states that the current DP 1.4 dual-monitor KVM does not emulate a monitor. Persistent EDID emulation keeps the display logically present to the switched-away host so window positions survive; TESmart implements it on the DKS and HKS families and markets "no window reset". For a developer, financial or CAD desk, that single difference outweighs another 100 Hz of theoretical headroom.
Switching time is link re-training, not input latency. Once a video link is established, a KVM does not add seconds of input lag. The multi-second blackout is EDID and HDCP re-negotiation plus the monitor's own mode sync. ATEN quotes roughly 3 seconds on the US3311; TESmart quotes 1–3 seconds on the HKS202-M24. Persistent EDID shortens the operating system's recovery, not the monitor's physical re-lock.
Cable count is part of the setup cost. At 4K144 and above, a KVM inserts a second cable segment into a path that previously had one, so marginal cables become visible. Level1Techs recommends DisplayPort cables of 4 m or less and warns specifically against improperly wired pin-20 voltage; Cable Matters states outright that poor DP cables cause flicker at high resolution. A dual-computer, dual-monitor DisplayPort installation needs four host cables plus two monitor cables, and a single-monitor dual-computer DisplayPort desk needs three. Certified VESA DisplayPort 1.4 cables such as Cable Matters 102025 and 48 Gbps HDMI cables such as Cable Matters 8K HDMI are the accessories worth budgeting with the switch itself.
USB bandwidth is shared, never doubled. A conventional KVM connects its hub to the selected host, so peripherals follow the active computer; the two machines never get independent simultaneous bandwidth. USB-C DP Alt Mode tightens this further because display lanes and SuperSpeed lanes share one connector — ATEN documents that its US3311 hub can fall back to USB 2.0 when video exceeds 4K60, which matters if you run external SSDs, capture hardware or a webcam.
Host topology sets the ceiling. Dual-monitor KVMs expect each computer to supply two independent DisplayPort or HDMI feeds, which is a cable and port problem on laptops. And a KVM can only route display engines the host already exposes: on Apple Silicon, a switch cannot turn a one-display Mac into a native two-display Mac, and MST-based docks mirror rather than extend on macOS. Driver-based DisplayLink docking stations are the workaround for insufficient native display engines, not native-passthrough KVMs. For the Windows- and macOS-friendly laptop topologies in this category, see our dual-monitor KVM picks.
#1 TESmart DKS202-M24 — Best Dual-DisplayPort High-Refresh KVM
Check the TESmart DKS202-M24 range on Amazon
The DKS202-M24 is the strongest dual-DisplayPort option here because it pairs high refresh with persistent EDID rather than trading one for the other. Each computer supplies two independent DP 1.4 signals; two DP outputs feed the monitors at 32.4 Gbps of link bandwidth.
- Two computers to two DisplayPort monitors, two independent DP 1.4 feeds per host
- Official modes: 8K60, 4K60, 4K120 and 4K144 at 8-bit, with dual 4K144/165 positioned via DSC 1.2a and 4K240 listed as a DSC mode per output
- DSC 1.2a documented, plus FEC, G-Sync and FreeSync support
- Smart EDID emulation: maintains display recognition and prevents layout and window resets while a source is switched away
- HDCP 2.3 on the current family specification
- Ultrawide support including 5120×1440 @ 120 Hz and 3440×1440 at high refresh
- USB 3.2 Gen 1 host links, two USB 3.0 peripheral ports plus dedicated keyboard/mouse handling
- Integrated Gigabit Ethernet that can be enabled or disabled
- Switching by hotkey, mouse wheel, front control or IR remote, with hot-plug support
- DisplayPort embedded audio; no Power Delivery to laptops
- Four PC-to-KVM DP cables and two USB 3.x host cables included; two additional DP cables are still needed for the monitors
Pros: persistent EDID emulation at 4K144; DSC and FEC documented rather than implied; dedicated keyboard/mouse path; Ethernet built in.
Cons: no laptop Power Delivery; two extra DP cables required beyond the bundle; DisplayPort only, so HDMI 2.1 displays need the sibling model.
Verdict: the desktop choice when the desk runs two DisplayPort monitors at 4K144 and window positions must survive every switch. Treat dual 4K144/165 as the operating point and 4K240 as a compressed mode that depends on the whole chain agreeing.
Perfect for: dual 4K144 gaming and creator desks on desktop GPUs, and anyone who switches several times a day and cannot tolerate desktop reflow.
#2 TESmart HKS202-M24-V2 — Best Dual-HDMI 2.1 High-Refresh KVM
The HKS202-M24-V2 is the HDMI counterpart to the DKS202, and it is the one to pick when the monitors are HDMI 2.1 gaming displays rather than DisplayPort panels. Two computers each feed two independent HDMI 2.1 signals at 48 Gbps, and EDID emulation stays active through every switch.
- Two computers to two HDMI 2.1 monitors; two independent HDMI feeds per host
- Documented modes: 8K30 8-bit, 4K144 8-bit, 8K60 8-bit with DSC, and 4K120 12-bit with DSC — compression and colour depth are mode-dependent rather than uniform across the range
- Persistent EDID emulation with ADI processing; TESmart markets the result as "no window reset"
- HDCP 2.3 on the current family specification
- VRR and ALLM passthrough for variable-refresh gaming displays
- USB 3.x shared peripheral hub plus Gigabit Ethernet for both computers
- Front USB-C port for low-power device charging, not laptop Power Delivery
- Display modes include both monitors extended or mirrored on one host, or one computer per monitor with keyboard and mouse focus switching
- Analog audio and microphone handling alongside HDMI embedded audio, with audio focus switchable independently
- Switching by configurable hotkeys, mouse, front buttons or IR remote, quoted at 1–3 seconds with source recognition maintained
- PC-side HDMI and USB cables supplied; the two monitor-side 48 Gbps HDMI cables are not
Pros: dual HDMI 2.1 at 48 Gbps; persistent EDID plus VRR and ALLM; Ethernet sharing; 4K120 12-bit DSC documented explicitly.
Cons: no laptop charging; monitor-side cabling adds two certified 48 Gbps HDMI cables; HDMI-only, so DisplayPort panels need the DKS202 instead.
Verdict: the cleaner pick for two HDMI 2.1 displays, provided the two monitor-side cables come from a certified 48 Gbps source — a Cable Matters 8K HDMI cable or the three-pack covers host and monitor sides in one order.
Perfect for: two gaming or workstation PCs sharing two HDMI 2.1 high-refresh monitors where VRR must survive the switch.
#3 Cable Matters 202070 — Best Value Single-Monitor High-Refresh DisplayPort KVM
For one high-refresh monitor shared between two desktops, the 202070 is the sharpest value in this group. It is a DisplayPort 1.4 switch rated to 8K60 and 4K240, with DSC, HDR, FreeSync and G-Sync passthrough — and Cable Matters advertises macOS 4K240 on compatible systems, which is unusual in this price class. For two-computer desk builds in general, our single-setup KVM picks cover the same topology at 4K60.
- Two computers to one DisplayPort monitor, DP 1.4
- Up to 8K60 or 4K240 with HDR, DSC, FreeSync and G-Sync passthrough
- No EDID emulation — stated explicitly by the manufacturer, so the display is logically disconnected from the inactive host
- Two USB 3.0 Micro-B host links and three downstream USB-A 3.0 ports at 5 Gbps
- Optional USB-C power connector for the switch itself, power only, not video
- Switching by chassis buttons and a wired remote; no driver required
- DisplayPort embedded audio only, with no separate analog jack
- No Power Delivery to laptops
Pros: the lowest-cost route to 4K144/240 on a single DisplayPort panel; DSC and G-Sync/FreeSync documented; macOS high-refresh support stated; remote switching.
Cons: windows rearrange after switching because there is no EDID emulation; embedded audio only; three certified DP cables should be budgeted for a two-PC desk.
Verdict: excellent frame rates for the money, with one honest trade-off. Buy it if you switch rarely or you already run Windows 11 window-location memory; skip it if your work depends on window positions surviving a switch.
Perfect for: one gaming or high-refresh monitor shared between two desktops on a tight budget.
#4 TESmart HKS401-M23 — Best Four-Computer High-Refresh KVM
Four HDMI 2.1 computers into one premium monitor is a specialist topology, and the HKS401-M23 is one of the few current switches that does it with EDID emulation on every input. Each of the four host-side cables combines HDMI and USB, so a full desk needs four host connections plus one monitor cable.
- Four computers to one HDMI 2.1 monitor, 48 Gbps
- Documented modes: 4K144 8-bit, 8K30 8-bit, 8K60 with DSC 8-bit, and 4K120 with DSC 12-bit
- DSC explicitly used for the 8K60 and 4K120 12-bit modes
- EDID emulator on each input to preserve host display information while another machine is selected
- HDCP 2.3 on the current manual and catalogue data
- USB 3.2 Gen 1 / USB 3.0 peripheral sharing with a dedicated keyboard/mouse path
- Front USB charging capped at 7.5 W; no laptop Power Delivery
- Programmable hotkeys, front buttons and IR remote, with both keyboard/mouse passthrough and legacy-emulation modes for peripherals that dislike emulated HID
- HDMI embedded audio plus USB and 3.5 mm audio facilities depending on variant
- Four combined HDMI and USB host cables included; the monitor-side HDMI 2.1 cable is not
Pros: four HDMI 2.1 hosts with per-input EDID emulation; explicit DSC mode table; flexible peripheral modes.
Cons: single monitor only, so dual-monitor users are in the wrong product; no laptop PD; the monitor-side 48 Gbps cable is a separate purchase.
Verdict: the right answer for a rack of machines — a workstation, a gaming PC, a work laptop dock and a test box — feeding one expensive display. Anyone running two monitors should take the DKS202 or HKS202 instead.
Perfect for: three- or four-machine desks with one premium HDMI 2.1 monitor and a hard requirement for EDID persistence.
#5 UGREEN 55851 — Best Budget Dual-DisplayPort KVM
Dual DisplayPort high refresh usually starts at the premium tier, and the 55851 is the value entry. It advertises 8K60 and 4K240 with HDR, FreeSync, G-Sync and VRR-class passthrough across two DP 1.4 monitor outputs fed by two independent DP signals per computer.
- Two computers to two DisplayPort monitors, DP 1.4
- Advertised modes: 8K60 and 4K240 with HDR and variable-refresh passthrough
- DSC is not documented, so the top 8K60 and 4K240 modes necessarily depend on a compressed or reduced-bandwidth negotiation rather than uncompressed transport
- No persistent EDID emulation, which is the decisive trade-off against the TESmart DKS202
- Four downstream 5 Gbps ports — three USB-A and one USB-C — shared with whichever host is selected
- No Power Delivery
- Chassis button plus a wired desktop controller; no keyboard hotkey switching
- Both monitors switch together; there is no independent per-monitor matrix mode
- DisplayPort embedded audio only, with no dedicated 3.5 mm output
- Two USB host cables, power supply and wired controller included; DisplayPort cables are not, and a fully populated dual-PC, dual-monitor desk needs six
Pros: the cheapest credible dual-DP high-bandwidth switch; wide VRR/HDR passthrough claims; the wired remote is more ergonomic than reaching behind the desk.
Cons: no EDID emulation, so the inactive computer sees a disconnect; no hotkeys; six DP cables push the real cost up; DSC behaviour undocumented, so maximum modes are not guaranteed.
Verdict: a legitimate budget dual-monitor switch, with realistic cable requirements — provided the buyer adds certified DP 1.4 cables to the budget and accepts display re-detection on every switch.
Perfect for: price-sensitive dual-monitor desktop setups where refresh rate matters more than desktop persistence.
#6 Level1Techs DisplayPort 1.4 KVM Switch (Dual Monitor, Two Computer) — Specialist Pick
Check the Level1Techs DisplayPort 1.4 KVM range on Amazon
Level1Techs builds for people who chase edge cases: unusual monitors, long DP runs, high-refresh experimentation. This dual-monitor model routes four DP 1.4 inputs to two DP 1.4 outputs and gives each video path its own switching hardware rather than sharing one global display bandwidth pool — which is why it holds up on chains that generic switches drop.
- Two computers to two DisplayPort monitors; four host DP 1.4 inputs, two monitor outputs
- Official guarantee: up to 4K120 or 8K30 per DisplayPort path, with lower resolutions running at higher refresh and DSC passthrough supported
- No monitor emulation. The inactive computer knows the display disappeared, and Level1Techs warns that windows can shuffle after switching; Windows 11 window-location memory or third-party tools are the mitigations
- USB: a 5 Gbps version with two USB-B USB 3.2 Gen 1 host links, or a 10 Gbps version with two data-only USB-C USB 3.2 Gen 2 host links
- Console side: USB 2.0 HID plus USB 3.x peripheral ports; peripherals follow the selected host rather than splitting bandwidth
- No Power Delivery — the USB-C ports on the 10 Gbps model carry data only
- Audio: two host-side 3.5 mm inputs, one console 3.5 mm output, plus DP embedded audio
- Front panel button switching; HID hotkeys work on most keyboards, though some Corsair models cannot trigger them from the HID ports
- No cables included; DisplayPort runs of 4 m or less are recommended, and short 2 m cables can rescue marginal links
Pros: dedicated switching hardware per video path; DSC passthrough; explicit 4K120/8K30 guarantee; USB 5 Gbps or 10 Gbps variants; unusually transparent about the missing monitor emulation.
Cons: no monitor emulation, so window reflow is expected; no Power Delivery; no bundled cables and up to six DP cables for a full install; sold direct rather than through mainstream retail.
Verdict: the specialist tool. It is the switch to buy when the monitors are exotic and the priority is making the link train at all — not when the priority is a desktop that never moves. Note that its "intelligent EDID engine" handles HDCP re-keying; it is not persistent emulation, and reviews that describe it as always-on EDID are describing a different behaviour.
Perfect for: enthusiasts and pro workstations pushing high-refresh DisplayPort configurations with non-standard monitors and cable runs.
#7 ATEN US3311 Duo Flex USB-C / DisplayPort KVM Dock — Best Laptop KVM Hybrid
Laptop desks want one cable per machine, and the US3311 is the cleanest version of that idea: two USB-C hosts share one DisplayPort monitor, with Power Delivery and a four-port USB hub riding the same links. It is a genuine KVM-plus-dock rather than a switch with a hub bolted on.
- Two USB-C hosts to one DisplayPort monitor via USB-C DP 1.4 Alt Mode
- Official support for 4K60, 4K120 and 4K144, plus 8K on qualifying Thunderbolt 4 or USB4 hosts with DP 1.4 accessories
- USB bandwidth can drop to USB 2.0 when video exceeds 4K60, because more high-speed lanes are reallocated to DisplayPort — the single most important caveat for anyone with external SSDs or capture hardware
- Video DynaSync display management, designed to maintain display information and reduce reconfiguration between hosts
- Four USB 3.2 Gen 1 Type-A ports, at up to 5 Gbps when link bandwidth allows
- PD 3.0 input up to 100 W; host port 1 receives the full PD budget while host port 2 is specified at up to 5 V/3 A
- Switching by a supplied wired port button; hotkeys are available through the ATEN KVM Utility on supported firmware
- DisplayPort switching takes roughly 3 seconds
- DisplayPort embedded audio; no separate analog audio path
- Two USB-C host cables and a power adapter supplied; one suitable DP cable to the display is still required
Pros: one USB-C cable per laptop for video, USB and charging; native DP Alt Mode rather than a driver-based graphics path; 4K144 on qualifying hosts; honest documentation of the USB bandwidth trade-off.
Cons: single monitor only; the USB hub cannot hold full SuperSpeed while driving above 4K60; only one host port receives full charging power; desktops without DP Alt Mode are incompatible.
Verdict: the best fit for a MacBook or work-laptop desk where one cable must carry everything. If you need more displays than the laptop's GPU exposes, a docking station with a built-in KVM or a Thunderbolt dock is the better architecture than a single switch, and our Mac dock picks cover that side of the desk.
Perfect for: laptop-first desks with two USB-C machines sharing one high-refresh DisplayPort monitor, where charging and peripheral sharing matter as much as video.
#8 StarTech P2DD46A2-KVM-SWITCH — Best Business and TAA Dual-4K60 KVM
Not every desk needs 144 Hz. The P2DD46A2 is a dual-DisplayPort 4K60 switch built for procurement: two computers, two monitors, discrete audio and USB switching, and a support ecosystem behind it. It also runs 2560×1440 at 144 Hz if you drop the resolution, which extends its useful life on 1440p panels.
- Two computers to two DisplayPort monitors, DP 1.2, dual 3840×2160 at 60 Hz
- 2560×1440 at 144 Hz supported on lower resolutions
- DSC is neither required nor advertised at its 4K60 target
- Its standout emulation is USB emulation, not persistent monitor EDID; StarTech's Windows Connectivity Tools can save and restore window layouts as a software workaround
- HDCP supported
- Two USB 3.2 Gen 1 ports at 5 Gbps plus two USB 2.0 HID ports downstream, with two 5 Gbps USB-B host links
- No Power Delivery
- Chassis push buttons and keyboard hotkeys; audio and USB/video can be switched independently
- Autoscan adjustable from 1 to 255 seconds
- Separate 3.5 mm audio routing
- No firmware or driver downloads published for the current revision
Pros: dependable dual 4K60; independent audio, USB and video switching; autoscan; TAA-compliant business positioning; 1440p144 support.
Cons: DisplayPort 1.2, so no 4K120 or 4K144; monitor EDID persistence is not the emulation feature here; no laptop charging.
Verdict: a procurement-grade switch, not a gaming one. The comparable IOGEAR GCS1942 covers the same dual-4K60 ground with RS-232 control, dedicated keyboard/mouse ports, separate speaker and microphone routing, autoscan and firmware updates, and it ships with a fuller cable kit — but it sits in the same 4K60 ceiling, so a higher price does not necessarily imply better video capability.
Perfect for: CAD, CAM and regulated environments where dual 4K60 is sufficient and TAA compliance matters.
#9 Sabrent USB-KCPD — Best Dual USB-C Laptop KVM with Simultaneous Charging
This is a narrow but genuinely useful device: two USB-C laptops, one HDMI 4K60 display, and up to 60 W of charging to each machine at the same time. That simultaneous-charging behaviour is rare — most laptop KVMs and docks charge only the active host.
- Two USB-C hosts to one HDMI 2.0 monitor, USB-C DP Alt Mode to HDMI 2.0, maximum 4K60
- Thunderbolt 3 compatible, but it is not a Thunderbolt switch internally
- No persistent EDID or emulation feature documented; DSC is not needed at its HDMI 2.0 4K60 target
- Keyboard and mouse sharing is USB 2.0-class rather than a high-speed USB 3 hub
- Power Delivery up to 60 W to each of the two computers simultaneously; each PD input needs its own external USB-C power adapter, and chargers are not supplied
- Switching by a physical push button
- HDMI embedded audio only
- Two 1 m USB-C-to-USB-C host cables included; HDMI cable and PD chargers are not
- Critical rule: each source's USB-C port must support DisplayPort Alt Mode — a desktop USB-C data port cannot produce the video signal
Pros: charges both laptops at once at up to 60 W each; tiny footprint; cheap route to a shared 4K60 laptop desk.
Cons: USB 2.0-class peripheral sharing, so external SSDs and capture cards are out; no EDID persistence; no high-refresh support; needs one or two separate chargers to be useful.
Verdict: buy it for two USB-C notebooks that both need to stay topped up between one 4K60 screen. Buy something else the moment the workflow includes fast storage or gaming refresh rates.
Perfect for: two-laptop desks — a work machine and a personal one — where charging parity matters more than USB throughput.
#10 MT-VIKI MT-KH802 — Budget Compromise HDMI 2.1-Class KVM
The MT-KH802 is included to answer a fair question — yes, a very cheap HDMI 2.1-class KVM exists — and to be precise about what that buys. Two computers share one HDMI display, with advertised 8K60, 4K120/144 and lower-resolution high-refresh modes.
- Two computers to one HDMI display, HDMI 2.1-class transport
- Advertised modes: 8K60, 4K120/144, plus lower-resolution high-refresh modes, with HDR advertised in the listing title
- DSC is not transparently documented, so the largest advertised modes should be treated more cautiously than the TESmart or Cable Matters equivalents
- No trustworthy persistent EDID documentation
- USB 3.0 peripheral switching; the split between general-purpose and dedicated keyboard/mouse ports varies by listing
- No Power Delivery
- Physical button plus a wired remote; no dependable hotkey support documented
- HDMI embedded audio
- Assume three certified HDMI 2.1 cables are required for two hosts and one display
Pros: the lowest entry cost in this roundup; HDMI 2.1-class transport and HDR advertised; wired remote included.
Cons: DSC, colour depth, EDID and HDCP behaviour are undocumented; no independent verification of the top modes; inconsistent availability.
Verdict: a legitimate compromise, not a disguised flagship. If the exact signal mode must be guaranteed — HDR workflows, colour-critical work, or a desk that switches constantly — the Cable Matters 202070 or a TESmart unit is the honest purchase.
Perfect for: hobby desks that want an HDMI high-refresh switch at minimum cost and can tolerate uncertainty about the top-end modes.
Comparison Table
| Product | Video interface | Top documented modes | Monitors | Computers | EDID behaviour | USB | Laptop PD |
|---|---|---|---|---|---|---|---|
| TESmart DKS202-M24 | DP 1.4 | Dual 4K144/165 via DSC 1.2a; 4K240 DSC per output; 8K60 | 2 | 2 | Persistent Smart EDID emulation | USB 3.2 Gen 1 + 2 USB 3.0 ports + dedicated K/M | No |
| TESmart HKS202-M24-V2 | HDMI 2.1 (48 Gbps) | 4K144 8-bit; 8K60 DSC; 4K120 12-bit DSC; 8K30 | 2 | 2 | Persistent EDID, no window reset | USB 3.x + dedicated K/M + GbE | No |
| Cable Matters 202070 | DP 1.4 | 8K60; 4K240 with DSC, HDR, FreeSync/G-Sync passthrough | 1 | 2 | None, stated explicitly | 3× USB-A 5 Gbps | No |
| TESmart HKS401-M23 | HDMI 2.1 (48 Gbps) | 4K144 8-bit; 8K60 DSC; 4K120 12-bit DSC | 1 | 4 | EDID emulator per input | USB 3.2 Gen 1 + dedicated K/M | No |
| UGREEN 55851 | DP 1.4 | Advertised 8K60 / 4K240 with HDR and VRR passthrough | 2 | 2 | None | 4× 5 Gbps (3× USB-A, 1× USB-C) | No |
| Level1Techs DP 1.4 KVM | DP 1.4 | 4K120 / 8K30 per path official; DSC passthrough | 2 | 2 | EDID handling, no monitor emulation | USB 3.2 Gen 1 (USB-B) or Gen 2 (USB-C, data only) | No |
| ATEN US3311 | USB-C DP 1.4 Alt Mode | 4K60 / 4K120 / 4K144; 8K with qualifying hosts | 1 | 2 | Video DynaSync display management | 4× USB 3.2 Gen 1 (5 Gbps when bandwidth allows) | Up to 100 W on host port 1; 5 V/3 A on port 2 |
| StarTech P2DD46A2 | DP 1.2 | Dual 4K60; 2560×1440@144 | 2 | 2 | USB emulation, not monitor EDID persistence | 2× 5 Gbps + 2× USB 2.0 HID | No |
| Sabrent USB-KCPD | USB-C DP Alt Mode → HDMI 2.0 | 4K60 | 1 | 2 | Not documented | USB 2.0-class keyboard/mouse sharing | Up to 60 W to each of two hosts, chargers not supplied |
| MT-VIKI MT-KH802 | HDMI 2.1-class | Advertised 8K60 / 4K120 / 4K144 | 1 | 2 | Not documented | USB 3.0 | No |
Which 4K KVM Switch Should You Buy?
Pick by what breaks first on your desk, not by the biggest number.
If window positions must survive every switch on a dual-monitor desk, choose persistent EDID emulation: the TESmart DKS202-M24 on DisplayPort and the TESmart HKS202-M24-V2 on HDMI 2.1. Both hold 4K144 and both keep the inactive host believing a monitor is attached.
If you only run one high-refresh monitor, drop the dual-monitor premium. The Cable Matters 202070 covers 4K144 to 4K240 with DSC and G-Sync passthrough at the lowest cost here, and its lack of EDID emulation only hurts if you switch mid-task. The MT-VIKI MT-KH802 sits below it on price but above it on uncertainty.
If you run four machines into one premium display, the HKS401-M23 with its per-input EDID emulator is the specialist answer, and nothing else in this list does that job at 4K144.
If budget is the constraint and you need two DisplayPort monitors, the UGREEN 55851 delivers dual-DP high bandwidth at the value tier — with the caveat that both monitors switch together and display re-detection is expected.
If your monitors are unusual or your DP runs are long, take the Level1Techs dual-monitor model and accept that window reflow is part of the design. Its dedicated per-path switching hardware is the reason it survives chains that cheaper switches drop.
If the desk is laptop-first, split by topology. Two USB-C laptops needing charge parity on one 4K60 screen: Sabrent USB-KCPD. One USB-C laptop desk that must reach 4K144 on a single cable with PD: ATEN US3311, keeping in mind the USB 2.0 fallback above 4K60.
If procurement rules the purchase, the StarTech P2DD46A2 covers dual 4K60 with TAA compliance and independent audio switching. Business desks running dual monitors on a single Thunderbolt host may be better served by our Thunderbolt 4 docking station picks with a standalone KVM downstream.
Frequently Asked Questions
Q: Does a 4K KVM switch add input lag while gaming?
No — not once the video link is established. A KVM passes the DisplayPort or HDMI stream through and does not insert frames. The multi-second delay users notice is switch and re-lock time: EDID and HDCP negotiation plus the monitor's own synchronisation. ATEN quotes about 3 seconds on the US3311 and TESmart quotes 1–3 seconds on the HKS202-M24, both of which occur only at the moment of switching.
Q: What is the difference between EDID support and EDID emulation?
EDID support means the switch reads, relays or re-keys the monitor's identification data — enough for the display to work and for HDCP to authenticate. EDID emulation means the switch keeps presenting a monitor to the computer that is currently switched away, so the operating system never sees a disconnect. Level1Techs explicitly states its current DP 1.4 dual-monitor model does not emulate a monitor; TESmart implements persistent emulation on the DKS and HKS families and markets "no window reset".
Q: Do I need DSC for 4K144?
It depends on the interface and the colour depth. DisplayPort 1.4 carries 32.4 Gbps raw and 25.92 Gbps of payload, which covers 4K144 8-bit on a healthy link; 4K240 needs DSC. On HDMI 2.1, 4K144 8-bit fits inside the 48 Gbps FRL budget, while 4K120 at 12-bit is documented by TESmart as a DSC mode. DSC is a low-latency, visually lossless compression method and is not the same thing as 4:2:0 chroma subsampling.
Q: Can a 4K KVM switch give my Mac two independent displays?
No. A switch can only route the display engines the Mac already exposes. Base M1 and M2 notebooks support one external display; base M3 added two external displays only in the lid-closed configuration; M4 and M5-generation MacBook Air models support two external displays with the built-in panel active; M5 Pro supports up to three and M5 Max up to four. MST-based docks mirror rather than extend on macOS, so dual-monitor KVMs that rely on MSC expect each computer to supply two genuinely independent video feeds.
Q: How many cables do I need for a dual-monitor, two-computer KVM?
Six DisplayPort cables for a DisplayPort KVM: two video feeds per computer into the switch, plus two cables from the switch to the monitors. Add two USB host cables if you want peripheral switching. A single-monitor, two-computer DisplayPort KVM needs three DP cables, and an HDMI equivalent needs three certified 48 Gbps HDMI cables. Level1Techs recommends runs of 4 m or less, and warns against cables with improperly wired pin-20 voltage.
Q: Can I run 144 Hz on a 4K60 KVM?
Yes, if you lower the resolution. DisplayPort 1.2 cannot carry 4K at 144 Hz, but it has enough bandwidth for 2560×1440 at 144 Hz, which the StarTech P2DD46A2 supports. This is why a 1440p gaming desk does not automatically need a DisplayPort 1.4 switch — only a 4K desk at 120 Hz or above does.
Q: Do USB-C KVMs charge both laptops at the same time?
Two behave differently. The Sabrent USB-KCPD delivers up to 60 W to each of its two computers simultaneously, but each PD input requires its own external USB-C charger, neither of which is supplied. The ATEN US3311 accepts up to 100 W of PD 3.0 input and passes the full budget to host port 1, while host port 2 is limited to 5 V / 3 A.
Q: Why does the screen go black for a second or two when I switch?
The monitor has to re-train the link: the switch re-negotiates EDID, re-keys HDCP where required, and the display re-synchronises to the incoming mode. Persistent EDID emulation shortens the operating system's recovery and stops windows from rearranging, but it does not eliminate the physical transition on the monitor itself.
Conclusion
The 4K KVM market rewards specificity. A conventional 4K60 office switch, a DisplayPort 1.4 high-refresh switch and a USB-C laptop KVM dock solve three different problems, and the number on the box does not distinguish them. Decide the signal first — 4K60 8-bit, 4K144 8-bit, or 4K120 12-bit with DSC — then EDID behaviour, then monitor count and host topology, and the shortlist narrows to two or three units.
For a dual-monitor desk at 4K144, the TESmart DKS202-M24 on DisplayPort and the HKS202-M24-V2 on HDMI 2.1 are the picks because they combine high refresh with persistent EDID emulation, which is the feature that keeps a working desktop intact across dozens of switches a day. For one high-refresh monitor, the Cable Matters 202070 does the job at the value tier; for four machines, the TESmart HKS401-M23 is the specialist; and for a laptop desk where one cable must carry video, USB and charging, the ATEN US3311 handles 4K144 natively without a driver-based graphics path.
Budget for cables at the same time as the switch. A dual-monitor DisplayPort KVM needs up to six certified cables, and marginal cables are the most common cause of flicker and dropped modes at 144 Hz and above.
Related reading:
- Best KVM Switches (2026): Complete Buying Guide
- Best KVM Switches for Dual Monitor Setups (2026)
- Best Docking Stations with Built-In KVM Switch (2026)
- Best Docking Stations for Dual Monitors (2026)
- What Is a KVM Switch? Meaning, Diagram & How It Works (2026)
For a dual-monitor 4K144 desk, the TESmart DKS202-M24 is the strongest starting point — check the current price on Amazon.
