Can a KVM switch handle two monitors of different sizes?

Yes. A dual-head KVM switch drives each output independently, so a 4K 27in and a 1080p 24in in portrait work together without issue.

Why does my desktop layout change when I switch?

Because the PC you switched away from stopped seeing the monitor EDID and treated it as unplugged. A switch with EDID emulation keeps presenting the descriptor to both machines so this never happens.

Do both monitors need the same resolution?

No, but if the switch uses one shared EDID across both heads, the monitor that did not supply it may be offered the wrong native mode. Per-port, per-head emulation avoids that.

Is a dual-monitor KVM the same as an MST splitter?

No. A true dual-head switch has two independent outputs. An MST splitter divides one output between two screens and shares the bandwidth, which matters at high resolutions and refresh rates.

Will it work if one PC is a laptop with the lid closed?

Yes, with EDID emulation. Without it, a lid-closed laptop that suddenly sees no displays while the KVM is switched away can suspend.

Does each output get the full rated bandwidth?

On a true dual-head switch it should, but some models quietly cannot run both outputs at full specification at the same time. Check that the listing states the spec with both displays active.

Does a KVM Switch Work With Two Different Monitors?

Yes, but the thing that decides whether it works cleanly is EDID emulation, not whether the switch supports both resolutions. Here is what to check.

Yes, a KVM switch works with two different monitors. The question people are actually asking is usually a different one, and it splits two ways depending on what they mean.

If you mean two monitors of different sizes and resolutions attached to the same PC, switched together, you need a dual-monitor KVM switch and the two panels can differ freely.

If you mean switching one monitor between two PCs that are configured differently, it works, and the thing that decides whether it works cleanly is EDID emulation rather than resolution support.

The Two Setups People Mean

Dual-monitor KVM. Two screens, two PCs, both screens switch together. You need a switch with two video outputs, and the bandwidth rules apply per output, not shared. A switch rated for 4K 60Hz gives you 4K 60Hz on each head, assuming it is a true dual-head design rather than an MST splitter. The monitors themselves can be entirely different: a 4K 27in next to a 1080p 24in in portrait is fine.

One monitor, two PCs, different configurations. This is where mismatched setups cause trouble, and the trouble is not really about the monitor. It is about what each PC believes is attached while it is not the active input.

Why EDID Is the Real Answer

Every monitor publishes an EDID, a small block of data describing what it is and what modes it supports. Your PC reads that block, picks a resolution and refresh rate, and lays out your desktop accordingly.

When a basic KVM switch flips to the other PC, the first PC stops seeing an EDID. As far as Windows is concerned the monitor was unplugged. It falls back to a default resolution, and it moves your windows. Switch back and it renegotiates, which takes a second or two and often does not restore your layout.

A switch with EDID emulation holds a copy of the monitor descriptor and keeps presenting it to both machines permanently. Neither PC ever knows the monitor went away. Switching becomes instant and nothing moves.

That is why two different monitors is rarely the problem and EDID usually is.

Spec Block: What to Check

True dual-head, not MST. Two physical outputs driven independently beats one output split, especially at high refresh rates
EDID emulation, per port and per head. A switch that emulates one shared EDID across two different monitors will describe at least one of them wrongly
Learned versus fixed EDID. Learned copies your actual monitor. Fixed ships a generic descriptor and may not advertise your top mode at all
Bandwidth per output at the resolution and refresh rate of your larger monitor
Whether both outputs run at full spec simultaneously, which some switches quietly do not
Rotation and scaling handling if one screen is in portrait

The Mismatched Resolution Edge Cases

Two genuinely different panels work, with two caveats worth knowing before you buy.

If your two monitors have very different resolutions and the switch uses a single shared EDID, whichever monitor did not supply that EDID may be offered the wrong native mode. Per-port, per-head emulation avoids this entirely.

If one PC is a laptop lid-closed on a dock, closing the lid while the KVM is switched away can cause the laptop to see no displays at all and suspend. EDID emulation fixes this too, for the same reason.

Winner

For two different monitors on two PCs, buy a dual-head switch with learned, per-port EDID emulation, and size the bandwidth to your more demanding panel. That combination removes every version of the problem at once, and it costs meaningfully less than discovering you need it after buying a cheaper switch.

Skip emulation only if both machines are desktops you rarely switch between and you do not mind windows moving.

Pros and Cons

Pros: Two full workspaces from one set of peripherals, monitors do not need to match, and a good switch makes the swap instant with no desktop rearrangement.

Cons: Dual-head switches cost noticeably more than single-head, cheap EDID implementations create the exact resolution flicker they are supposed to prevent, and running two high refresh panels through one switch needs real bandwidth on both outputs.

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