SmartAVI

SmartAVI SDX-XT-4P-S

Expert rating8 / 10

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

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Manufacturer: SmartAVI Last updated: September 12, 2026

SmartAVI SDX-XT-4P-S Review

The SmartAVI SDX-XT-4P-S is a 4-port extended-reach DisplayPort KVM switch with CATx extension support.

The 'XT' in the name signals SmartAVI's extended-reach line, this model can place computers or the console farther away than a standard DisplayPort cable allows, using CATx extension technology, a genuinely different capability from the standard-reach SM-DPN-4Q-S in this catalog. That's the deciding factor for facilities where the server room and the operator desk aren't in the same location.

Extended-Reach Architecture

Unlike SmartAVI's standard SM-series switches, the SDX-XT-4P-S is built around CATx extension, letting computers or the console sit well beyond the reach of a standard DisplayPort cable.

Four Computers at Full 4K@60Hz, Even at Distance

The extended architecture doesn't sacrifice resolution, all four computer inputs still support full 4K@60Hz even when extended over CATx cabling.

Comparison to Alternatives

Versus the SmartAVI SM-DPN-4Q-S, that's a standard-reach quad-monitor switch without extension capability, worth it when the console sits right next to the computers. Versus the SmartAVI SM-D2H-4Q-S, that bridges DisplayPort to HDMI at standard reach, worth it for mixed-signal needs rather than distance.

Our verdict

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

Expert rating8 / 10

The right pick when a 4-computer DisplayPort KVM setup needs real distance between computers and console, not just switching.

Best for

Facilities needing the console placed well away from the connected computers
Server rooms separated from the operator desk by more than standard cable length
Four-computer DisplayPort setups requiring CATx extension

Not for

Standard desk distances where extension isn't needed (a SM-series switch is cheaper)
Setups needing more than 4 computers
HDMI-only environments

Specifications

What these specs mean

Capability Score

6.7/10

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, extended reach

Topology

Displays Per Computer	4 displays
KVM Segment	Desk

Video & Features

Video Standard	DisplayPort
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

Display continuity

EDID Emulation	Yes (learns each monitor)

USB peripheral switching

USB Switching Speed	USB 2.0

In the box and price

Price	1282.26 USD

FAQs

What are the key specifications of the SmartAVI SDX-XT-4P-S (4-Port Extended KVM Switch)?

The SmartAVI SDX-XT-4P-S (4-Port Extended KVM Switch) is a KVM switch from SmartAVI. Key specs: Port Count 4 computers, Switching Method Button, hotkey, software, extended reach, Video Standard DisplayPort, Max Resolution 4K@60Hz, USB Hub Ports 4.

Who is the SmartAVI SDX-XT-4P-S (4-Port Extended KVM Switch) best suited to?

Best suited to: Facilities needing the console placed well away from the connected computers; Server rooms separated from the operator desk by more than standard cable length; Four-computer DisplayPort setups requiring CATx extension.

What are the drawbacks of the SmartAVI SDX-XT-4P-S (4-Port Extended KVM Switch)?

Not the best fit for: Standard desk distances where extension isn't needed (a SM-series switch is cheaper); Setups needing more than 4 computers; HDMI-only environments.