StarTech VS421HDDP 4K 60Hz HDMI and DisplayPort Switch

Overview

The StarTech VS421HDDP is a 4-port video switch that consolidates three HDMI sources and one DisplayPort source onto a single HDMI display, passing 4K resolution at a full 60Hz refresh. It's the kind of box you reach for in a control room, ops center, or conference room rack when you've got more compute sources — NVR workstations, a VMS client, a laptop input, a media player — than display inputs to plug them into. Rather than crawling behind a monitor to swap cables every time the source changes, the VS421HDDP handles switching automatically or on demand from the included IR remote or front-panel buttons. Steel housing and a compact 3.9 x 2.8 x 0.8 in footprint make it easy to tuck into a rack shelf or mount under a desk near an operator console.

Key Features

• 3x HDMI + 1x DisplayPort 1.2 inputs: covers a mixed-source rack — DVRs/NVRs on HDMI, a workstation GPU on DisplayPort — without an extra adapter box in the signal chain.
• 4K @ 60Hz output with 18Gbps bandwidth: enough throughput for 4096x2160 or 3840x2160 at full frame rate with no motion judder, which matters when you're monitoring live video wall feeds rather than static desktop content.
• 4:4:4 chroma subsampling: keeps text and fine UI detail sharp on VMS dashboards and spreadsheet-heavy displays instead of the color smearing you get with subsampled 4:2:0 signals at high resolution.
• HDCP 2.2 support: passes protected 4K content from Blu-ray players and streaming boxes without a black-screen handshake failure — a common failure point on cheaper switches that only support HDCP 1.4.
• Automatic and manual switching (IR remote, front panel): auto-switch jumps to the last active source so an operator doesn't have to hunt for the right input button during a live incident; manual override is there when you need to pin a specific feed.
• 7.1 surround sound passthrough: carries multichannel audio embedded in the HDMI/DP signal through to the display or downstream AVR, so you're not routing a separate audio cable alongside the video switch.
• Broad resolution support (4096x2160 down to 1280x720): the VS421HDDP negotiates down cleanly for older sources instead of blanking the output, useful when mixing legacy 1080p equipment with newer 4K gear on the same switch.
• Compact steel chassis (15.1 oz, 3.9 x 2.8 x 0.8 in): small enough to zip-tie into a rack or sit under a monitor stand without eating desk space.
• Wide input voltage range (100-240V AC): runs on any regional mains without a voltage converter, worth knowing for multi-site deployments outside North America.
• 0C to 45C operating range: tolerates a warm equipment closet or unconditioned rack room better than consumer-grade AV switches rated only for living-room temperatures.

Integration & Compatibility

Because the VS421HDDP outputs standard HDMI at HDCP 2.2, it drops into most existing security operations center or network video recorder display setups without special drivers — it's a signal-layer switch, not a networked device, so there's nothing to provision on the LAN. If you're feeding it from IP cameras or NVR outputs, pair it with properly rated HDMI cabling to keep the 18Gbps bandwidth intact over longer cable runs. For sites planning a broader video wall or multi-monitor operator station, review a VMS architecture guide before finalizing how many switches and displays the room needs. The VS421HDDP works alongside StarTech's broader StarTech catalog of KVM and video distribution gear, and complements AV mounts for rack-mounted control room builds.

What's in the Box

The VS421HDDP ships with the switch unit, IR remote control, and external power adapter (100-240V AC input, 5V DC / 1000mA output).

Frequently Asked Questions

Q: Does the VS421HDDP support 4K at 60Hz on all inputs?

A: Yes — the switch supports up to 4096x2160 and 3840x2160 at 60Hz across its HDMI and DisplayPort inputs, backed by 18Gbps of bandwidth and 4:4:4 chroma subsampling.

Q: How many sources can I connect to the VS421HDDP?

A: Four total — three HDMI inputs and one DisplayPort 1.2 input — switching to a single HDMI output.

Q: Can I switch inputs without a remote?

A: Yes — the VS421HDDP supports automatic switching as well as manual switching from front-panel buttons, in addition to the included IR remote.

Q: Does it pass audio along with video?

A: Yes, it supports 7.1 surround sound passthrough alongside the video signal.

Q: What's the warranty on the VS421HDDP?

A: The VS421HDDP carries a 2-year manufacturer warranty.

Q: What operating temperature range is it rated for?

A: 0C to 45C operating, with a storage range of -20C to 70C, and 10% to 90% RH operating humidity.

Ted Perry

The spec that jumps out on the VS421HDDP is the 18Gbps bandwidth figure — that's what lets it actually hold 4096x2160 at 60Hz with 4:4:4 chroma instead of quietly dropping to 4:2:0 or 30Hz the way cheaper switches do when a source gets demanding. I spec these for ops centers where an operator is bouncing between an NVR client, a VMS workstation, and a laptop on the same monitor.

Technical Highlights:

• 3x HDMI + 1x DisplayPort 1.2 input mix: covers the two most common workstation outputs on one switch, so you're not stuck buying a separate DP-to-HDMI adapter for that one GPU with only DisplayPort out.
• HDCP 2.2 compliance: matters if any source is protected 4K content — HDCP 1.4-only switches will black-screen on a 2.2 source, and that's a support call you don't want at 2am.
• Automatic switching to last-active source: in a monitoring context, this means the display jumps to whichever feed just went active without an operator hunting for the right button during an incident.

Deployment Considerations:

• Power input is universal 100-240V AC, so multi-region rollouts don't need a voltage converter — just confirm plug type locally.
• Watch the operating temp ceiling: 45C is fine for a conditioned rack room but tight for an outdoor enclosure or poorly ventilated closet in summer — plan airflow accordingly.

I'd put the VS421HDDP in a small security ops center or NOC where one operator monitor needs to cycle between three or four rack-mounted sources without a KVM's added cost and complexity — it's overkill for a single-source home AV setup and underkill for a full video wall, but it's the right tool for that specific in-between job.