Adder Technology

Adder AVS-4128

Expert rating8 / 10

Computers:: 8
Video:: DisplayPort 1.2 / HDMI
Max Resolution:: 3840x2160 @ 60Hz
Certification:: NIAP PP 4.0

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Manufacturer: Adder Technology Last updated: 2026-09-12

Adder AVS-4128 (8-Port Video Switch / DP/HDMI / 4K / $1980.00) Review

Adder AVS-4128 8-port video switch DisplayPort HDMI 4K60 rack KVM

Scales the AVS-4114's desktop architecture up to eight DisplayPort/HDMI sources in a rack-mountable frame, aimed at labs and monitoring walls that outgrew a 4-port switch but don't need the AVS-1124's DVI and multi-format inputs.

Eight Sources, One Rack Unit

The AVS-4128 packs eight source inputs into a 1U-high chassis (optional RMK14 rack kit) that accepts a mix of single- and dual-head computers, a natural step up for labs or monitoring rooms that have outgrown a 4-port desktop switch.

Comparison to Alternatives

Compared to the AVS-1124, the 4128 offers double the port count at a lower price but skips DVI and multi-format flexibility, sticking to DisplayPort/HDMI only. Against Aten's higher-end CS19208 (8-port enterprise KVM), the AVS-4128 favors pure video switching over full USB/KVM console duplication.

Specifications

Design

Port Count	8
Switching Method	Front-panel buttons, Ctrl + mouse across screen border

Topology

Computers Supported	8 computers
Displays Per Computer	2 displays
Total Video Inputs	8
Total Video Outputs	2
KVM Segment	Secure

Video & Features

Video Standard	DisplayPort 1.2 / HDMI (dual-mode ports)
Max Resolution	3840x2160 @ 60Hz
USB Hub Ports	0
Audio Support	Yes

Video interface

Video Connector	Mixed
Video Interface Version	DisplayPort 1.2

Per display capability

Max Resolution Single Display	3840x2160
Max Refresh At Max Resolution	60 Hz
Max Refresh At 4K	60 Hz
Max Resolution All Displays Active	3840x2160
Max Refresh All Displays Active	60 Hz

USB peripheral switching

HID Emulation	Yes

Switching control

Button Switching	Yes
Mouse Or Cursor Switching	Yes

Audio

Analog Audio Jacks	Yes

Physical and power

Rack Mountable	Yes
External Power Required	Yes

In the box and price

Price	1980.00 USD

Brand	Adder
Model	AVS-4128
Security Certification	NIAP PP 4.0
Enclosure	1U-high, optional RMK14 rack kit
Source URL	https://www.adder.com/en/kvm-solutions/adderview-secure-avs-4128-flexi-switch

Expert Review

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

Expert rating8 / 10

A capable 8-port rack switch for labs needing more sources than a 4-port desktop unit, without the premium of full multi-format support.

Best for

Lab benches with 8+ test systems
Monitoring walls needing rack mounting
Facilities standardized on DP/HDMI

Not for

Legacy DVI-only equipment
Single-desk 4-source users
Budget home labs

FAQs

What are the key specifications of the Adder AVS-4128 (8-Port Video Switch / DP/HDMI / 4K / $1980.00)?

The Adder AVS-4128 (8-Port Video Switch / DP/HDMI / 4K / $1980.00) is a KVM switch from Adder Technology. Key specs: Port Count 8, Switching Method Front-panel pushbutton + RS232 control, Video Standard DisplayPort / HDMI, Max Resolution 4K@60Hz, USB Hub Ports 2.

Who is the Adder AVS-4128 (8-Port Video Switch / DP/HDMI / 4K / $1980.00) best suited to?

It suits lab benches with 8+ test systems, monitoring walls needing rack mounting, facilities standardized on dp/hdmi.

What are the drawbacks of the Adder AVS-4128 (8-Port Video Switch / DP/HDMI / 4K / $1980.00)?

It is a poor fit for legacy dvi-only equipment, single-desk 4-source users, budget home labs.