SmartAVI

SmartAVI SM-UHN-4Q-S

Expert rating8 / 10

Port Count:: 4 computers, quad HDMI
Video Standard:: HDMI
Max Resolution:: 4K@60Hz
USB Hub Ports:: 4

Consumercarts is reader-supported. Learn more

Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.

Manufacturer: SmartAVI Last updated: September 12, 2026

SmartAVI SM-UHN-4Q-S Review

The SmartAVI SM-UHN-4Q-S is a 4-port quad-HDMI KVM switch with 4K@60Hz output.

This is SmartAVI's HDMI-native quad-monitor unit, aimed at buyers who want a four-computer, four-monitor spread without dealing with DisplayPort adapters or DVI legacy cabling. It's the HDMI sibling to the SmartAVI SM-DPN-4Q-S in this catalog, same quad-monitor concept, different connector standard, so the choice mostly comes down to which video standard the existing monitor bank already uses.

Native Quad-HDMI, No Adapters

All four video paths are HDMI end to end, avoiding the signal quirks that come from adapting DisplayPort or DVI sources into an HDMI monitor wall.

4K Across the Whole Bank

Every one of the four monitors can run a full 4K@60Hz feed from its assigned computer, not a downgraded resolution reserved for a single primary display.

Comparison to Alternatives

Versus the SmartAVI SM-DPN-4Q-S, that's the DisplayPort version of the same quad-monitor concept, worth it if the monitor bank is DP-native. Versus the Adder AV4PRO-DVI-QUAD, that uses older DVI video and RS232 control, worth it only for legacy DVI installations.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating8 / 10

A clean, modern quad-HDMI KVM for a genuine four-computer, four-monitor HDMI installation.

Best for

Control rooms and video walls built entirely on HDMI monitors
Four-computer setups wanting native 4K@60Hz on every display
Buyers who want to avoid DisplayPort-to-HDMI adapter compatibility issues

Not for

DisplayPort-native monitor banks (see the SM-DPN-4Q-S instead)
Single or dual-monitor desks needing something smaller
Legacy DVI/VGA installations

Specifications

What these specs mean

Capability Score

5.6/10

How much this switch can do compared with other desk KVM switches, rated from its specifications.

Design

Port Count	4
Switching Method	Button, hotkey, software

Topology

Displays Per Computer	4 displays
KVM Segment	Desk

Video & Features

Video Standard	HDMI
Max Resolution	4K@60Hz
USB Hub Ports	4
Audio Support	Yes

Per display capability

Max Refresh At Max Resolution	60 Hz
Max Refresh At 4K	60 Hz

USB peripheral switching

USB Switching Speed	USB 2.0

Switching control

Hotkey Switching	Yes

In the box and price

Price	1047.94 USD

FAQs

What are the key specifications of the SmartAVI SM-UHN-4Q-S (4-Port Quad HDMI KVM Switch)?

The SmartAVI SM-UHN-4Q-S (4-Port Quad HDMI KVM Switch) is a KVM switch from SmartAVI. Key specs: Port Count 4 computers, quad HDMI outputs, Switching Method Button, hotkey, software, Video Standard HDMI, Max Resolution 4K@60Hz, USB Hub Ports 4.

Who is the SmartAVI SM-UHN-4Q-S (4-Port Quad HDMI KVM Switch) best suited to?

Best suited to: Control rooms and video walls built entirely on HDMI monitors; Four-computer setups wanting native 4K@60Hz on every display; Buyers who want to avoid DisplayPort-to-HDMI adapter compatibility issues.

What are the drawbacks of the SmartAVI SM-UHN-4Q-S (4-Port Quad HDMI KVM Switch)?

Not the best fit for: DisplayPort-native monitor banks (see the SM-DPN-4Q-S instead); Single or dual-monitor desks needing something smaller; Legacy DVI/VGA installations.