Collection: KVM Cables

Which KVM cable do you actually need?

Most PC builders only think about the KVM switch itself and treat the cables as an afterthought, then wonder why their 4K monitor flickers or their mouse drops out when they swap machines. A KVM cable set carries three jobs: video, USB for keyboard and mouse, and sometimes audio. The tier you need depends on what the video leg has to carry, not on the brand printed on the box.

Entry-tier cables are usually HDMI 1.4 or DisplayPort 1.2 class with USB 2.0 signalling. They handle 1080p at 60Hz or 1440p at 60Hz without drama, and USB 2.0 at 480Mbps is plenty for a keyboard and mouse. Conductor gauge is thin, shielding is basic, and past about 2 metres you start seeing sparkles or dropouts because the signal margin is slim.

Sweet-spot cables are built for HDMI 2.0 or DisplayPort 1.4 bandwidth, meaning 4K60 with HDR or 1440p at high refresh. They use thicker conductors, better foil and braid shielding, and often include a USB 3.0 leg for a hub or webcam. This is where most home office and dual-PC gaming setups should land.

Enthusiast cables target HDMI 2.1 at 48Gbps or DisplayPort 1.4 and 2.1 for 4K at 120Hz and above, or ultrawide high refresh panels. Certification matters here, and you want active or optical options for longer runs. Diminishing returns hit hard if your monitor tops out at 1440p 144Hz, because that fits comfortably inside sweet-spot bandwidth.

Upgrading and technical nuances

The biggest trap is that the KVM switch sets the ceiling, not the cable. A premium HDMI 2.1 cable plugged into a switch with HDMI 2.0 chips still gives you HDMI 2.0 behaviour. Match the cable to the switch's rated resolution and refresh rate, then match both to your display.

Bandwidth maths helps. HDMI 2.0 tops out at 18Gbps, enough for 4K60 at 8-bit or 10-bit with some chroma limits. DisplayPort 1.4 has roughly 25.9Gbps of usable bandwidth and leans on Display Stream Compression for 4K at 144Hz. DSC is visually lossless to most eyes, but many KVM switches do not pass it cleanly, so a cable that is technically capable can still fail in the chain. Current graphics cards often offer DisplayPort 2.1, but unless your switch and screen support it, you are running at the lowest common link rate anyway.

EDID emulation is the nuance people miss. Good KVM switches fake a monitor's identity to inactive machines so windows do not rearrange themselves when you switch. Cables with poor DDC line handling can break that handshake, which causes black screens and resolution resets. Thicker, properly shielded cables from ATEN, StarTech.com and Belkin tend to behave more consistently here than unbranded packs.

For USB, the common KVM cable uses USB-A to USB-B, with the square end going into the switch. USB 3.0 versions add extra differential pairs and cost more, but they are only worth it if you are passing through a fast dock, webcam or storage. Keyboards and mice work fine on USB 2.0. If your machines are newer laptops or small desktops from the computers range, USB-C to DisplayPort alt mode cables can replace the whole bundle, but check the switch supports it.

Benchmark families to look for include ATEN's 2L-7D series for integrated KVM cables, StarTech.com's SVHDMI and DisplayPort KVM cable sets, Cable Matters certified HDMI 2.1 and DisplayPort 1.4 leads, and UGREEN for sensible mid-priced HDMI and USB runs. The step up is generally certified Ultra High Speed HDMI cables or VESA-certified DisplayPort cables, which have been tested rather than just marketed.

Practical things to check

Length is the first gotcha. Passive HDMI 2.0 and DisplayPort 1.4 are reliable to about 2 to 3 metres at full bandwidth, and USB 3.0 passive cables get unreliable beyond 3 metres. If your desk and tower are far apart, go active or optical rather than stacking extensions.

Connector clearance is the second. The rear of many computer cases has limited room behind the GPU, and chunky moulded connectors can foul on a tight case wall or a vertical GPU mount. Right-angle adapters help but add another signal joint, so use ones rated for the same bandwidth. Also check that the cable's bend radius suits a cramped desk, because stiff, well-shielded cables resist tight turns.

Port count and type on your machines matter. Check your motherboard rear I/O if you plan to use integrated graphics, because some boards offer HDMI only, and others offer DisplayPort or USB-C video. Mixing GPU and motherboard outputs causes headaches when the display only wakes from one.

Ports on the switch for each cable type are rarely interchangeable. A "3-in-1" cable might be video plus USB plus audio, while others are video plus USB only. Count the connectors, and don't assume.

Finally, if you're building a KVM over IP setup for remote management, your networking gear matters as much as the cables, and a managed switch from TP-Link can keep that traffic tidy. Browse cables and connectors for matching adapters, and keep a spare short cable around for troubleshooting.

Brands and local warranty

ATEN is the benchmark for purpose-built KVM cables, StarTech.com covers a wide range of adapters and KVM leads, and Belkin is solid for everyday USB and video. Cable Matters, UGREEN and Club3D offer well-tested HDMI and DisplayPort runs, while Lindy is worth a look for specialist lengths.

Local warranty matters because cable failures are intermittent and annoying. A genuine Australian warranty means you deal with a local support team, you avoid international shipping on a cheap item, and you know the stock is authentic rather than relabelled. It also covers you under Australian Consumer Law if a cable claiming 4K120 can't do it.

Frequently asked questions

Can I use any HDMI cable with a KVM switch?

Physically yes, but performance varies. A standard cable may work at 1080p but fail at 4K60 or HDR. Use cables rated for the bandwidth your switch advertises, and keep them short.

Do I need USB 3.0 KVM cables for a keyboard and mouse?

No. USB 2.0 handles input devices easily. USB 3.0 cables only matter if you share fast peripherals such as a webcam, dock or external drive through the switch.

Why does my screen go black when I switch computers?

Usually it's an EDID or handshake issue. The switch may not hold the monitor's identity, or the cable's DDC line is poor quality. Try a shorter, better-shielded cable first, then check the switch's firmware and settings.

Is DisplayPort better than HDMI for KVM setups?

Depends on the switch. DisplayPort offers high refresh rates, but many KVMs handle HDMI more consistently. Use whichever your switch and monitor both support natively, rather than converting between them.

How long can a KVM cable be before quality drops?

For passive high-bandwidth video, about 2 to 3 metres is the safe zone. Beyond that, use active or optical cables, or reduce resolution and refresh rate.