SmartAVI

SmartAVI SDHN-4D-P 4-Port Dual-Head Secure KVM

Expert rating7.9 / 10

Port Count:: 4
Video Standard:: DisplayPort input / HDMI output
Max Resolution:: 4K@30Hz per head

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Manufacturer: SmartAVI Last updated: 2026-09-12

SmartAVI SDHN-4D-P 4-Port Dual-Head Secure KVM Review

SmartAVI SDHN-4D-P 4 port dual head DisplayPort to HDMI secure KVM CAC classified four computer

Scaling the SDHN-2D-P's built-in DisplayPort-to-HDMI conversion to four computers, the SDHN-4D-P lets a two-monitor HDMI desk cover four classified networks fed by DisplayPort sources, with switched CAC included as standard.

Conversion at Four-System Scale

Each of the four isolated channels performs its own DP-to-HDMI conversion internally, so the certified security boundary covers the full signal path regardless of which of the four networks is active.

Consistent CAC Support

As with the 2-port SDHN-2D-P, the CAC/PIV port ships standard rather than as a separate Pro tier, keeping the SDHN line's feature set consistent across port counts.

Comparison to Alternatives

Against the SDPN-4D-P, which needs native DisplayPort displays, the SDHN-4D-P is the pick for facilities with existing HDMI monitor fleets. For a four-monitor version of the same conversion capability, see the SDHN-4Q-P.

Our verdict

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

Expert rating7.9 / 10

A solid 4-system dual-monitor pick for facilities bridging DisplayPort source computers to an established HDMI display fleet, with CAC included.

Best for

4-system dual-monitor desks bridging DisplayPort sources to HDMI displays
Facilities standardizing on built-in DP-to-HDMI secure conversion
Sites needing CAC switching without buying a separate reader

Not for

Native DisplayPort monitor environments (see SDPN-4D-P)
Native HDMI source computers needing no conversion
Four-monitor desks better served by the SDHN-4Q-P

Specifications

What these specs mean

Capability Score

6.6/10

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

Design

Port Count	4
Switching Method	Front-panel pushbutton

Topology

Displays Per Computer	2 displays
KVM Segment	Secure

Video & Features

Video Standard	DisplayPort input / HDMI output
Max Resolution	4K@30Hz per head
USB Hub Ports	3
Audio Support	No

Per display capability

Max Refresh At Max Resolution	30 Hz
Max Refresh At 4K	30 Hz

Display continuity

EDID Emulation	Yes (learns each monitor)

USB peripheral switching

USB Switching Speed	USB 1.1

Switching control

Hotkey Switching	No

In the box and price

Price	935.58 USD

FAQs

What are the key specifications of the SmartAVI SDHN-4D-P 4-Port Dual-Head Secure KVM (DP to HDMI)?

The SmartAVI SDHN-4D-P 4-Port Dual-Head Secure KVM (DP to HDMI) is a KVM switch from SmartAVI. Key specs: Port Count 4, Switching Method Front-panel pushbutton, Video Standard DisplayPort input / HDMI output, Max Resolution 4K@30Hz per head, USB Hub Ports 3.

Who is the SmartAVI SDHN-4D-P 4-Port Dual-Head Secure KVM (DP to HDMI) best suited to?

Best suited to: 4-system dual-monitor desks bridging DisplayPort sources to HDMI displays; Facilities standardizing on built-in DP-to-HDMI secure conversion; Sites needing CAC switching without buying a separate reader.

What are the drawbacks of the SmartAVI SDHN-4D-P 4-Port Dual-Head Secure KVM (DP to HDMI)?

Not the best fit for: Native DisplayPort monitor environments (see SDPN-4D-P); Native HDMI source computers needing no conversion; Four-monitor desks better served by the SDHN-4Q-P.