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The UGREEN 55851 is the best DisplayPort KVM switch for most two-computer desks: two hosts, two DP 1.4 monitors, no drivers, and a wired controller instead of software. For a single monitor, the Cable Matters 202070 is the better-documented pick, and if you need dual 4K144 with real EDID emulation, the TESmart HDK202-M24-USBK is the one to pay for. Everything below follows the same logic as the KVM switch buying guide: how many independent DisplayPort links each computer must supply, and whether the switch keeps your monitors alive while you use the other PC.
What separates these units is not the resolution on the box. It is the number of separate video streams a host has to produce, whether the switch emulates your monitor's EDID so the inactive computer still sees a display plugged in, and how much USB bandwidth survives once the video link has taken its share of the lanes.
The category also hides a naming trap. A "4-port" DisplayPort KVM is usually a two-computer switch with four shared USB ports, not a four-host switch. Only the host count tells you how many computers you can actually cycle through, and only the port map tells you what each computer has to be wired to.
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Quick Picks
| Pick | Best for | Hosts | Displays | Host video input |
|---|---|---|---|---|
| UGREEN 55851 | Best value dual-monitor desk | 2 | 2 | 2 × DisplayPort per host |
| UGREEN 25962 | Best budget single monitor | 2 | 1 | 1 × DisplayPort per host |
| Cable Matters 202070 | Best documented single monitor | 2 | 1 | 1 × DisplayPort per host |
| IOGEAR GCS82DPC | Desktop plus USB-C laptop, cheap | 2 | 1 | 1 × DP and 1 × USB-C DP Alt Mode |
| IOGEAR GCS1953 | Three hosts with laptop charging | 3 | 1 (MST to 2) | 2 × DP and 1 × USB-C |
| TESmart HDK202-M24-USBK | Dual 4K144 with EDID emulation | 2 | 2 | DP 1.4 and HDMI 2.1 per host |
| StarTech SV231DPDDUA2 | Business dual 4K60 with support | 2 | 2 | 2 × DisplayPort per host |
| ATEN CS1944DPA | Four-computer workstation | 4 | 2 | 2 × DisplayPort per host |
| StarTech R8AD122-KVM-SWITCH | Eight-host local rack | 8 | 1 | 1 × DisplayPort per host |
| Eaton B024-DPU08 | Enterprise rack with OSD | 8 | 1 | 1 × DisplayPort per host |
What Makes a Great DisplayPort KVM Switch?
Signal topology comes first. A dual-monitor DisplayPort KVM does not split one video stream into two; it switches two independent DisplayPort links per computer. A laptop with a single video output cannot feed it without adapters or a dock that creates two genuine streams, which is why the docking stations with DisplayPort outputs guide and this one keep arriving at the same wiring question. Cable count follows directly: a two-computer, two-monitor switch needs four host-side DisplayPort cables plus two to the monitors. On long or thin runs, link training at HBR3 is where flicker and dropouts appear, so short certified cables are part of the product, not an accessory.
EDID behavior is the second divider. A hard switch physically removes the display from the inactive computer, which then treats its monitors as unplugged: windows can jump back to the primary screen, games can reset to a different resolution, and the return to the first PC costs a few seconds of DisplayPort retraining. A unit with EDID emulation keeps presenting the monitor's identity to both computers at all times, so the desktop layout survives the switch. The distinction is not the same as HDCP re-keying, which handles protected content, or keyboard and mouse emulation, which only concerns HID parsing. A switch can have any combination of the three, and only explicit EDID emulation changes what the inactive PC sees.
High refresh is a bandwidth negotiation, not a checkbox. DisplayPort 1.4 carries 32.4 Gbps raw across four lanes, and modes such as 4K240 or 8K60 fit only when the source GPU, the KVM, the cable and the monitor all support Display Stream Compression. DSC is a chain requirement: a KVM that advertises 4K240 without source and display support will fall back, and no switch can add compression the endpoints do not implement. If your target is high refresh rather than high resolution, the 4K KVM switches at 60Hz and high refresh comparison covers the models built specifically for it.
USB and video compete for the same lanes on any USB-C host. One of the clearest examples in the whole category is the IOGEAR GCS1953, which pairs 4K60 with USB 2.0 data on its USB-C path, and 4K30 with 5 Gbps USB. Manufacturers that list "4K60" and "USB 3.0" as separate bullets are often describing mutually exclusive configurations. On conventional DisplayPort KVMs the host link is separate from the video link, so the ceiling is set by the switch's own hub: USB 2.0 at 480 Mbps is enough for keyboards, mice and audio, and not enough for an external SSD or a capture device.
Finally, macOS does not behave like Windows here. MST is a DisplayPort feature for carrying several streams over one link, and Windows uses it to build independent extended desktops while macOS mirrors instead. That is a host limitation, and a KVM cannot override it. A KVM switch is a router of signals, not a graphics chip, so the safe approach is to give each Mac the number of independent display streams its chip supports and let the switch move those streams.
#1 UGREEN 55851: Best Dual-Monitor Value
Two computers, two monitors, and a wiring run most people underestimate until it arrives.
- 2 computers to 2 DisplayPort monitors; each host provides two independent DP feeds plus USB-A
- DisplayPort 1.4; up to 8K60 advertised alongside 4K240, 4K120 and 4K60 modes
- VRR, G-SYNC and FreeSync advertised; HDR advertised
- No EDID emulation, stated by UGREEN
- No hotkey switching; chassis button plus wired desktop controller
- Shared hub of 4 × USB 3.0 at 5 Gbps (3 × USB-A, 1 × USB-C); no Power Delivery
- Included: 2 × USB-A host cables, power adapter, desktop controller. The four DisplayPort cables are not included
Check the UGREEN 55851 on Amazon
Pros
- Two native DisplayPort paths per host, so no MST dependency and no macOS mirroring trap
- Four shared 5 Gbps ports cover keyboard, mouse, audio and a headset at once
- Cheap route into dual-monitor switching with no software to install
Cons
- No EDID emulation: the inactive PC sees its monitors disconnect, and windows can move
- Every host must supply two DisplayPort outputs, which rules out most single-port laptops without a dock
- DisplayPort cables are on you, and this setup needs four of them
Verdict: the honest baseline for a two-PC, two-monitor DisplayPort desk. Accept the hard switch and the cable count, and it does the job the premium tier charges several times more for.
Perfect for: a desktop and a work laptop, both with native dual DisplayPort outputs, on a fixed desk.
#2 UGREEN 25962: Best Budget Single-Monitor Switch
- 2 computers to 1 DisplayPort monitor; 2 × DP inputs, 1 × DP output
- DisplayPort 1.4; up to 7680 × 4320 at 60 Hz advertised, backward compatible with 4K240, 4K120 and 4K60 where the whole chain supports the mode
- No persistent EDID emulation
- Shared hub of 4 × USB 3.0 at 5 Gbps (3 × USB-A, 1 × USB-C); no Power Delivery
- Chassis button plus wired desktop controller; no hotkeys
- Audio carried inside the DisplayPort signal only, with no 3.5 mm extraction
- Included: 2 × DisplayPort cables and 2 × USB-A-to-USB-C host cables
Check the UGREEN 25962 on Amazon
Pros
- Ships with both the DisplayPort and host USB cables, so a two-PC setup is complete out of the box
- 5 Gbps shared hub rather than a USB 2.0-only console
- Works as a plain hardware switch across Windows, macOS and Linux
Cons
- The USB-C ports on the chassis are shared data ports, not video inputs and not laptop charging
- A laptop still needs its own DisplayPort output or a USB-C-to-DP adapter upstream
- No EDID emulation, and no dedicated audio jack
Verdict: the least expensive way into a two-computer DisplayPort desk, with the cables included, as long as you understand that no USB-C port on it carries video.
Perfect for: two desktops with native DisplayPort outputs sharing one monitor.
#3 Cable Matters 202070: The Best-Documented Single-Monitor Pick
- 2 computers to 1 DisplayPort monitor; 2 × DP host inputs, 1 × DP output
- DisplayPort 1.4; 7680 × 4320 at 60 Hz, with 4K240 also marketed
- No native EDID emulation; Cable Matters describes its range as hard switches
- USB upstream over 2 × USB 3.0 Micro-B; shared hub of 3 × USB-A 3.0 at up to 5 Gbps
- Switching by chassis buttons and an individually paired wireless remote; hotkeys are not the main mechanism
- Audio via DisplayPort only; no analog panel
- Included: 2 × USB 3.0 Micro-B host cables, 2 × DisplayPort 1.4 cables, USB extension cable, AC adapter, RF remote with battery
- The USB-C connector on the unit is for optional KVM power only, not host video or Power Delivery
Check the Cable Matters 202070 on Amazon
Pros
- Complete package: host cables, DisplayPort cables, power adapter and remote all included
- Documented behavior rather than marketing copy, including the hard-switch EDID limitation
- Optional external power for heavier USB loads on the shared hub
Cons
- No EDID emulation, so windows can return to the primary display after a switch
- USB 3.0 Micro-B upstream is an older connector standard to plan for
- High-refresh and ultrawide setups are sensitive to cable quality here
Verdict: the safest mid-tier single-monitor choice, because what it does and does not do is written down. Plan on short certified DisplayPort cables and skip unnecessary adapters in a 4K240 or ultrawide chain.
Perfect for: a two-PC single-monitor workstation where predictable behavior matters more than the lowest possible cost.
#4 IOGEAR GCS82DPC: Best Budget Desktop-Plus-Laptop Hybrid
- 2 computers: one conventional DisplayPort desktop plus one USB-C computer, to 1 DisplayPort monitor
- DisplayPort 1.2; maximum 4096 × 2160 at 60 Hz; HDCP compliant
- USB-C host must support DisplayPort Alt Mode; a single cable carries video plus keyboard and mouse
- Desktop path brings its own DisplayPort, USB-A and analog audio/mic connections
- Dedicated USB-A console ports for keyboard and mouse; not a modern 5 Gbps storage hub
- Separate 3.5 mm speaker and microphone jacks
- 6 ft wired remote selector; no keyboard hotkeys documented
- No Power Delivery; the laptop is not charged through the switch
- Runs bus-powered; a Micro-USB power source may be needed in some installations
Check the IOGEAR GCS82DPC on Amazon
Pros
- Accepts a USB-C laptop directly, with no dock in front of the switch
- Analog audio and microphone switching on a separate path from the video
- Integrated computer-side cables keep the desktop end tidy
Cons
- DisplayPort 1.2 and one monitor only, so no path to dual 4K60
- No laptop charging and no SuperSpeed peripheral hub
- High-refresh 1440p or 4K gaming is outside its bandwidth
Verdict: it solves the exact topology most people have, a gaming desktop with DisplayPort and a work laptop with only USB-C, and it stops there on purpose. Convenience pick, not a bandwidth leader.
Perfect for: a desktop tower and a USB-C laptop sharing one DisplayPort monitor, with no charging requirement.
#5 IOGEAR GCS1953: Best Multi-Host Hybrid with Laptop Charging
- 3 computers: two conventional DisplayPort machines plus one USB-C DP Alt Mode host
- One native DisplayPort console output; MST can extend to a second compatible display
- DisplayPort 1.2; HDCP 1.4; maximum 4096 × 2160 at 60 Hz on one monitor
- Up to 45 W of Power Delivery to the USB-C host
- Shared hub of 2 × USB 3.1 Gen 1 Type-A at 5 Gbps; upstream over 2 × USB 3.0 Type-B plus USB-C
- USB-C host runs 4K60 with USB 2.0 data, or 4K30 with USB 3.0 at 5 Gbps
- Switching by front buttons, keyboard hotkeys, three-button mouse and a wired remote
- HD audio over DisplayPort plus analog 3.5 mm audio and mic; DisplayPort audio cannot be switched independently
- Included: 2 × DisplayPort cables, 2 × USB-A-to-B cables, USB-C cable, 3 × audio cables, wired remote, 12V adapter
- Firmware upgradeable
Check the IOGEAR GCS1953 on Amazon
Pros
- The only hybrid here that charges the laptop, up to 45 W
- Three hosts on one console, with independent switching of KVM, USB and audio focus
- Analog microphone switching alongside the DisplayPort audio path
Cons
- On the USB-C host, 4K60 and 5 Gbps USB are not available at the same time
- No persistent EDID emulation documented
- MST expansion will mirror rather than extend on macOS
Verdict: the clearest illustration in the category that USB-C KVM specs are a lane-allocation problem. If you run a USB 3.0 SSD or capture card through the shared hub, budget for 4K30 on that host.
Perfect for: two desktops plus one USB-C laptop, where the laptop needs charging and high refresh is not the priority.
#6 TESmart HDK202-M24-USBK: Best Premium High-Refresh Pick
- 2 computers to 2 displays, with DP 1.4 and HDMI 2.1 inputs per host
- Advertised modes: 7680 × 4320 at 60 Hz with DSC, 3840 × 2160 at 240 Hz with DSC, 5120 × 1440 at 120 Hz, 3440 × 1440 at 144 Hz, 2560 × 1440 at 240 Hz
- Dual-monitor high refresh advertised as 4K144/160-class with DSC 1.2a
- Dedicated EDID emulation using an ADI 7674 implementation, holding display presence during switching
- HDR10+ and Dolby Vision claims; G-SYNC and FreeSync; FVA and ALLM; HDCP 2.3
- Shared USB 3.0 at 5 Gbps plus front charging; 3.5 mm headset audio with independent USB and audio focus lock
- Shared Gigabit Ethernet
- Switching by front button, keyboard hotkeys, mouse wheel and IR remote; vendor quotes roughly 1 to 3 seconds
- Active fan; includes 2 KVM host cables, 2 DisplayPort cables, IR remote, 12V adapter
- No USB-C laptop Power Delivery, since this is not a USB-C host switch
- Advanced switching features depend on the dedicated keyboard and mouse ports; Bluetooth peripherals are not part of that path
Check the TESmart HDK202-M24-USBK on Amazon
Pros
- EDID emulation that actually keeps both computers convinced a monitor is attached
- Mixed DP 1.4 and HDMI 2.1 inputs, so a DP desktop and an HDMI laptop both connect natively
- Gigabit Ethernet sharing and independent audio focus on top of the video switching
Cons
- DSC is required for the headline 4K240 and dual 4K144 modes, and that requirement runs through the whole chain
- Active fan, which not every desk tolerates
- Keyboard and mouse must be on the dedicated ports for the full hotkey set
Verdict: the feature-complete option. EDID preservation plus dual high-refresh support is precisely what the budget units cannot deliver, and it is the difference between a switch and a nuisance.
Perfect for: a two-PC gaming or color-critical desk running dual displays at 144 Hz or above.
#7 StarTech SV231DPDDUA2: Best Established Dual 4K60 for Business
- 2 computers to 2 monitors; 4 × DisplayPort inputs total, two per computer, two console outputs
- DisplayPort 1.2; 3840 × 2160 at 60 Hz per display
- Host USB over 2 × USB-B at USB 2.0, 480 Mbps; 4 × USB-A 2.0 console ports including keyboard/mouse and shared peripheral roles
- Dedicated 3.5 mm analog audio
- Switching by physical pushbutton and keyboard hotkeys; no drivers
- Hotkey support is documented with limitations around emulated HID behavior on macOS
- The 4-port USB 2.0 console is not a storage hub; external SSDs belong elsewhere
- No Power Delivery
- DisplayPort and USB host cables are not included, which means four DisplayPort cables plus host cables on top of the switch
- Universal external power adapter included; not rackmountable
Check the StarTech SV231DPDDUA2 on Amazon
Pros
- Long market history and vendor support behind it, including TAA and business procurement paths
- Two independent DisplayPort feeds per computer, so no MST dependency
- Analog audio switching on a discrete path
Cons
- 4K60 ceiling, which makes it the wrong tool for a 4K144 desk at this tier
- USB 2.0 host links only, so no external SSD on the shared hub
- Cables not included, which pushes real deployment cost well past the unit itself
Verdict: a mature 4K60 professional switch sold on support and procurement, not on specs. Buy it for the dual 4K60 office or studio workstation, not for gaming.
Perfect for: business or creative workstations where 4K60 on two displays and vendor support decide the purchase.
#8 ATEN CS1944DPA: Best Four-Computer Workstation Switch
- 4 DisplayPort computers to 2 DisplayPort displays; 8 × DP inputs total, two per computer
- DisplayPort 1.4; formal maximum specification of 7680 × 4320 at 60 Hz, 5120 × 2880 at 60 Hz and 4096 × 2160 at 120 Hz
- Higher refresh modes such as 4K144, 4K165 and 4K240 are marketed, and depend on DSC plus source and display support
- HDR10+; MST and DP++ supported; HDCP compliant
- Upstream over 4 × USB 3.1 Gen 1 Type-B; shared hub of 2 × USB 3.1 Gen 1 Type-A at 5 Gbps
- Switching by pushbuttons, wired remote selector, keyboard hotkeys, mouse-wheel switching and RS-232
- KVM, USB hub and audio focus switch independently; keyboard and mouse emulation with bypass modes
- Analog microphone and speaker connections plus HD audio
- Two CS1942DPA units can be coordinated for a four-display setup
- Included: 8 DisplayPort cables, 4 USB-A-to-B cables, 4 mic cables, 4 speaker cables, wired remote and power adapter
- Metal desktop chassis, not a 1U rack unit; no Power Delivery
Check the ATEN CS1944DPA on Amazon
Pros
- Four hosts on two displays with a genuinely complete cable bundle in the box
- Independent switching of video, USB and audio focus, plus RS-232 for automated control
- The 2026 DPA generation moves to DP 1.4 and 8K60-class host capability
Cons
- No Power Delivery, so laptops need their own chargers
- Desktop form factor, not a rack mount
- The advertised high-refresh modes are configuration-dependent; the formal table is the conservative figure
Verdict: the rare four-computer DisplayPort switch that ships with every cable you need. Price it against the whole cable order, not against a bare switch.
Perfect for: a workstation with four machines and two displays, where independent USB and audio focus is part of the workflow.
#9 StarTech R8AD122-KVM-SWITCH: Best Eight-Host Local Rack Switch
- 8 computers to 1 DisplayPort monitor
- DisplayPort 1.2; 3840 × 2160 at 60 Hz class
- Host USB over USB-B 2.0-class links; built-in 4-port USB 2.0 hub, two front and two rear, at 480 Mbps
- Shared 3.5 mm analog audio plus the DisplayPort audio path
- Switching by front pushbuttons and keyboard hotkeys, with audible and LED confirmation
- No drivers; OS-independent across Windows, macOS, ChromeOS and Linux
- Explicitly supports Intel, AMD, Snapdragon/ARM and Apple Silicon platforms
- 1U rackmount chassis with a 19-inch rack kit included
- Universal external power adapter included; host cables sold separately
Check the StarTech R8AD122-KVM-SWITCH on Amazon
Pros
- Eight DisplayPort hosts in a single 1U unit with the rack kit in the box
- Platform-agnostic, Apple Silicon included
- Button plus hotkey switching with physical confirmation at the rack
Cons
- 4K60 ceiling, so it is a server and workstation tool rather than a gaming switch
- USB 2.0 hub only for shared peripherals
- Host cables are not included, and eight of them change the budget
Verdict: the practical answer to the homelab eight-host problem, where most legacy rack hardware is still VGA or DVI. If the rack also holds a 4K144 gaming machine, that machine needs its own path. The rack-mount and server KVM switches comparison covers the alternatives.
Perfect for: a local server rack or homelab with eight DisplayPort machines on one console.
#10 Eaton B024-DPU08: Best Enterprise Eight-Port with OSD
- 8 computers to 1 DisplayPort monitor
- DisplayPort 1.2; maximum 4096 × 2160 at 60 Hz; HDCP 2.2
- Stereo and HD audio support
- Host connectors carry DisplayPort, USB and optional 3.5 mm audio
- Peripheral hub documented as 2-port USB 3.1, with the same specification table also labelling the underlying technology as USB 2.0 High Speed; treat end-to-end 5 Gbps as unconfirmed rather than assumed
- Switching by chassis pushbuttons, keyboard hotkeys, a multilingual OSD and remote selector
- Auto Scan, firmware upgrade support, and administrator/user password functions
- Cascading up to two levels, with advertised control of as many as 128 computers
- 1U 19-inch rackmount; TAA compliant
- Included: 2 × DisplayPort 1.4 cables, 2 × USB 3.0 A-to-B cables, 2 × analog audio cables, firmware cable, rack hardware, 12V/3.3A power supply
- Only two host cable sets ship with an eight-host unit, so six more sets are a planned purchase
Check the Eaton B024-DPU08 on Amazon
Pros
- OSD with per-port naming and two-level password security, which local display-only KVMs do not offer
- Cascading to 128 hosts when eight ports are not enough
- TAA compliant with firmware upgrade support in the field
Cons
- 4K60 over DisplayPort 1.2 only
- USB generation is described inconsistently in the vendor documentation, so plan peripherals conservatively
- Two host cable sets out of eight, and the unit is priced in an enterprise bracket
Verdict: buy this for administration features rather than video features. OSD, cascading, passwords and TAA procurement are what the money buys, and 4K60 covers server and workstation consoles fine.
Perfect for: a managed rack where port naming, cascading and controlled access matter more than refresh rate.
Comparison Table
| Model | Hosts | Displays | DP version | Host video input | Host USB | EDID emulation | Switching |
|---|---|---|---|---|---|---|---|
| UGREEN 55851 | 2 | 2 | 1.4 | 2 × DP per host | USB-A host, 4 × shared 5 Gbps | No | Button + wired controller |
| UGREEN 25962 | 2 | 1 | 1.4 | 1 × DP per host | USB-A host, 4 × shared 5 Gbps | No | Button + wired controller |
| Cable Matters 202070 | 2 | 1 | 1.4 | 1 × DP per host | 2 × USB 3.0 Micro-B, 3 × shared 5 Gbps | No | Buttons + RF remote |
| IOGEAR GCS82DPC | 2 | 1 | 1.2 | 1 × DP, 1 × USB-C DP Alt Mode | Integrated host cables | Not listed | Wired remote |
| IOGEAR GCS1953 | 3 | 1 (MST to 2) | 1.2 | 2 × DP, 1 × USB-C | 2 × USB 3.0 Type-B + USB-C | Not listed | Buttons, hotkeys, mouse, remote |
| TESmart HDK202-M24-USBK | 2 | 2 | 1.4 | DP 1.4 + HDMI 2.1 per host | USB 3.0 host, 5 Gbps shared | Yes (ADI 7674) | Button, hotkeys, mouse, IR |
| StarTech SV231DPDDUA2 | 2 | 2 | 1.2 | 2 × DP per host | 2 × USB-B, USB 2.0 | Not advertised | Pushbutton + hotkeys |
| ATEN CS1944DPA | 4 | 2 | 1.4 | 2 × DP per host | 4 × USB 3.1 Gen 1 Type-B | Not listed | Buttons, hotkeys, mouse, RS-232 |
| StarTech R8AD122-KVM-SWITCH | 8 | 1 | 1.2 | 1 × DP per host | USB-B, USB 2.0-class | Not listed | Pushbuttons + hotkeys |
| Eaton B024-DPU08 | 8 | 1 | 1.2 | 1 × DP per host | DP + USB per host | Not listed | Buttons, hotkeys, OSD, remote |
Nothing in this shortlist uses DisplayPort 2.1. The high-refresh desktop market still runs DP 1.4 with DSC, and the professional rack segment is still largely DP 1.2 at 4K60.
Which DisplayPort KVM Switch Should You Buy?
Two computers and one monitor, with cables in the box: the UGREEN 25962 is the cheapest complete package, and the Cable Matters 202070 is the one to choose when you want the documentation to match the hardware. Both are hard switches, so windows will move when you change hosts.
Two computers and two monitors: the UGREEN 55851 at the value end, provided each computer has two DisplayPort outputs. If your work also involves window layout discipline, dual high refresh or a mixed DisplayPort and HDMI pair of machines, the TESmart HDK202-M24-USBK is the upgrade that changes the experience rather than the numbers. The StarTech SV231DPDDUA2 sits between them as a 4K60 business switch bought for support and procurement.
One desktop plus one USB-C laptop: the IOGEAR GCS82DPC is the direct route when the laptop does not need charging, and the IOGEAR GCS1953 is the one to take when it does, with the caveat that 4K60 and 5 Gbps USB are mutually exclusive on its USB-C host. If the laptop has only USB-C and no dock, putting a dock in front of the KVM is a different and often better topology than buying a hybrid switch.
Four computers on two displays: the ATEN CS1944DPA, which arrives with eight DisplayPort cables and four host USB cables and supports independent video, USB and audio focus.
Eight computers in a rack: the StarTech R8AD122-KVM-SWITCH if you want a 1U local switch with the rack kit included, or the Eaton B024-DPU08 if you need an OSD, cascading to 128 hosts, password control and TAA compliance. Budget for the missing host cables either way.
Mac users: check the chip before the switch. A KVM that advertises MST does not give an Apple Silicon Mac independent extended desktops through one DisplayPort stream. Feed the switch the number of separate display streams the Mac can actually generate, and treat DisplayLink, which renders graphics over USB and needs its own driver, as a different architecture entirely. If a DisplayLink dock is already in the chain, the DisplayLink and Plugable driver guide covers the permission and wake behavior that trip people up.
Frequently Asked Questions
Q: How many DisplayPort cables does a dual-monitor KVM need?
Four host-side cables plus two to the monitors, six in total. Each computer supplies two independent DisplayPort feeds, one per monitor, because the switch routes separate video streams rather than splitting one signal. Most dual-monitor models ship with two DisplayPort cables at most, and some ship with none, so cable cost belongs in the purchase decision. Keep the host runs short and prefer certified cables once HBR3 or DSC modes are involved.
Q: Will a DisplayPort KVM give my Mac two independent extended displays?
Not by itself. macOS mirrors rather than extends across an MST branch, and the number of independent external displays is set by the chip, not the switch. M1 and M2 MacBook Air models natively drive one external display up to 6K at 60 Hz, an M3 Air handles one with the lid open and a second in a supported clamshell configuration, M1 Pro and M2/M3 Pro systems support up to two, and Max-tier chips up to four. M4 Air supports two in addition to the built-in display, base M4 and M4 Pro MacBook Pro models support two with the lid open, and M4 Max supports four. Give the KVM exactly that many native streams.
Q: What does DSC change at 4K120 and 4K240?
Display Stream Compression fits high-resolution and high-refresh modes inside the available link bandwidth, and DisplayPort 1.4 reaches modes like 4K240 and 8K60 only when the source GPU, the KVM, the cable and the monitor all support it. It is a chain property, not a switch feature: a KVM advertising 4K240 will fall back if the display or the graphics output cannot compress. Ultra High Speed HDMI cable and certified short DisplayPort cable matter more, not less, once DSC is in play.
Q: Can I put a USB-C dock in front of a DisplayPort KVM?
Yes, and for laptops with a single video-capable USB-C port it is often the better topology: laptop to dock or USB-C-to-DisplayPort adapter, then the KVM, then the monitors. The switch sees ordinary DisplayPort and USB signals and behaves normally. Two things to avoid: don't put a DisplayLink dock behind a conventional KVM and expect clean switching, because it re-enumerates like an unplugged USB device, and don't assume a USB-C-to-DP adapter will hold a 4K high-refresh link that the adapter itself was never rated for.
Q: Can I cascade a DisplayPort KVM to control more than eight computers?
Yes, on models designed for it. The Eaton B024-DPU08 supports up to two cascade levels with advertised control of as many as 128 computers, and adds per-port naming through its OSD so you can find the right host without counting buttons. Cascading uses the same proprietary or vendor-specified host cabling as the base unit, so expansion cost scales with the cable sets rather than the switches alone.
Conclusion
The DisplayPort KVM category splits cleanly into two philosophies. Low-cost switches route a genuine DisplayPort signal and accept that the inactive computer loses sight of its monitors, which costs you window rearranging and a few seconds of link training per switch. Premium units add EDID emulation so both machines always see the displays they are wired to, and that single feature is what most of the price difference buys.
For a two-computer, two-monitor desk, the UGREEN 55851 is the value baseline and the TESmart HDK202-M24-USBK is the upgrade that fixes the experience. For a single monitor, the Cable Matters 202070 is the best-documented pick at its tier. Above that, the ATEN CS1944DPA covers four computers with every cable included, and the StarTech R8AD122-KVM-SWITCH and Eaton B024-DPU08 handle eight hosts in a rack with different priorities: local switching versus OSD, cascading and controlled access.
Whichever you choose, work out the wiring before the wiring works against you. Count the independent DisplayPort streams each computer can produce, count the cables you will need, and check whether the USB tier of the switch is enough for the peripherals you actually plug in.
