StarTech CK4-D404C Secure 4-Port Quad-Monitor DVI KVM Switch, NIAP 4.0

Overview

The StarTech CK4-D404C is a NIAP Protection Profile 4.0-certified secure KVM switch built for environments where physical isolation between connected computers is a non-negotiable requirement — government workstations, defense contractor desks, classified intelligence facilities, and any multi-domain workspace where data contamination between sessions cannot be tolerated. It supports four computers, each driving up to four DVI monitors simultaneously, at resolutions up to 2560x1600 at 60Hz — so analysts and engineers can maintain full-resolution quad-monitor productivity while switching between isolated hosts without ever moving cables or compromising air-gap security policies.

The metal enclosure (12.6 in × 6.7 in × 4.9 in, 4.2 lb) is dense enough to stay planted on a desktop without drifting, yet compact relative to its 16-port DVI-I connector complement. If you are sourcing KVM infrastructure for a KVM switch deployment in a classified or high-assurance environment, the CK4-D404C (often searched as CK4 D404C) is one of the few desktop-form-factor units that actually carries NIAP 4.0 — not just claims it.

Key Features

• NIAP Protection Profile 4.0 Certification: NIAP PP 4.0 is the current U.S. government benchmark for peripheral sharing switches used in classified multi-domain environments. Hardware-enforced isolation prevents data leakage between connected hosts at the silicon level — not just software filtering. If your procurement requirement cites NIAP PP 4.0 specifically, this unit satisfies it. Earlier NIAP versions (3.0 and below) do not meet the same criteria, so confirm your contract language before substituting.
• Four Independent Computer Ports: Supports four physically separate hosts simultaneously. Each host connection is isolated from the others by design — there is no shared data path between connected systems. This matters in multi-classification environments where a single cable swap error carries serious consequences.
• Quad-Monitor Output Per Computer: Each of the four connected hosts can drive four monitors independently. With 16x DVI-I (23-pin) host connectors onboard, the entire quad-display configuration for all four computers is handled through a single switch chassis — no stacking, no daisy-chaining.
• 2560x1600 at 60Hz Maximum Resolution: DVI Dual-Link throughput at 2560x1600 60Hz means high-density workstation displays (30-inch wide-gamut monitors) operate at native resolution. Operators working with geospatial imagery, signal analysis waveforms, or multi-window intelligence dashboards won't be resolution-constrained by the KVM layer.
• USB Console Interface — 3x USB 2.0 Type-A: Three USB 2.0 Type-A console ports handle keyboard, mouse, and a third USB peripheral (CAC reader, for example). USB data paths are filtered through the NIAP-certified isolation architecture — USB traffic from one host cannot bridge to another, which is the primary attack vector in non-certified KVM devices.
• USB PC Interface: Hosts connect via USB for keyboard and mouse emulation. Standard USB-B to USB-A cables connect each computer — no proprietary cabling required on the host side, which simplifies procurement and sparing.
• Metal Enclosure: The all-metal chassis resists physical tampering and provides the RF shielding baseline expected in high-security installations. Plastic-chassis KVMs are typically not acceptable in NIAP-required deployments regardless of software claims.
• Operating Temperature 0°C to 40°C (32°F to 104°F): Designed for standard indoor conditioned office and data center environments. Not rated for industrial or uncontrolled-temperature spaces — if the rack room runs hot, verify ambient stays below 40°C at the switch location.
• 3-Year Manufacturer Warranty: StarTech backs this unit with a 3-year warranty, which aligns with typical government equipment lifecycle expectations and simplifies long-term support planning.

Integration and Compatibility

The CK4-D404C connects to host computers via DVI-I video and USB. Each host requires a DVI video output (four DVI connections per host for full quad-monitor use) and a USB port for HID emulation. Hosts running Windows, Linux, or other OS platforms are supported provided the OS handles standard USB HID devices — no driver installation is required on the host for basic keyboard and mouse operation.

The three USB 2.0 Type-A console ports accommodate keyboard, mouse, and an additional USB device. In CAC-required environments, the third port is commonly used for a smart card/CAC reader — confirm your specific CAC reader model is compatible with the NIAP-filtered USB path before deployment, as some USB devices with non-HID profiles may be blocked by the security filtering architecture as intended behavior. For broader secure KVM switch options across different video interfaces, review the full catalog.

DVI-I connectors on the host side accept both DVI-D and DVI-I cables, providing some flexibility when existing cable infrastructure is DVI-D only. Display-side connector type should be confirmed against your monitor inventory before ordering cables. For guidance on planning a multi-host workstation setup, the KVM switch selection guide covers port count, video interface, and security certification tradeoffs in detail.

Pair this switch with appropriate KVM cables — StarTech and third-party DVI and USB cables are both usable, though cable quality affects signal integrity at 2560x1600; use high-quality Dual-Link DVI cables for resolutions above 1920x1200.

Frequently Asked Questions

Q: Is the StarTech CK4-D404C NIAP PP 4.0 certified?

A: Yes. The CK4-D404C carries NIAP Protection Profile 4.0 certification, the current U.S. government standard for peripheral sharing switches used in classified and multi-domain environments.

Q: How many monitors does the CK4-D404C support per connected computer?

A: The CK4-D404C supports four monitors per computer across all four host ports, using 16 DVI-I (23-pin) connectors in total to drive the full quad-display configuration for each host.

Q: What is the maximum display resolution supported?

A: The CK4-D404C supports a maximum resolution of 2560x1600 at 60Hz over DVI Dual-Link — sufficient for 30-inch wide-format displays at native resolution.

Q: What USB devices can be connected to the console ports?

A: The three USB 2.0 Type-A console ports support keyboard, mouse, and one additional USB peripheral such as a CAC reader. USB traffic is filtered through the NIAP-certified isolation architecture, so non-HID USB devices may be restricted as a function of the security design.

Q: What is the warranty on the CK4-D404C?

A: StarTech provides a 3-year manufacturer warranty on the CK4-D404C.

Q: What operating environment does the CK4-D404C require?

A: The CK4-D404C is rated for operating temperatures of 0°C to 40°C (32°F to 104°F) at 0–80% relative humidity non-condensing — standard conditioned office or data center environments. It is not designed for industrial or uncontrolled-temperature spaces.

Jerry Tildsen

The thing that separates the CK4-D404C from the crowded field of desktop KVMs is the NIAP Protection Profile 4.0 certification — not a self-declared claim, but a formally evaluated and listed certification. In practice, that means the hardware isolation architecture has been independently tested against a defined threat model, and the USB filtering is not just software-layer blocking. For any procurement that references NIAP PP 4.0 by name, this is the unit to specify.

Technical Highlights:

• 16x DVI-I Host Connectors: Four DVI connections per host computer across all four ports — the full quad-display stack for every seat is handled through a single chassis with no add-on modules or stacking required.
• 2560x1600 @ 60Hz: DVI Dual-Link throughput at this resolution means 30-inch wide-format monitors operate at native pixel density, which matters for analysts working with high-resolution geospatial or signals data who can't accept a resolution-reduced KVM layer.
• 3x USB 2.0 Type-A Console Ports: The third console USB port is the practical difference-maker — it accommodates a CAC reader inline without requiring a separate hub, which is the standard configuration for CAC-authenticated multi-domain workstations.

Deployment Considerations:

• Plan your cable run carefully: at 2560x1600 resolution, Dual-Link DVI cable quality matters. Low-quality or long-run cables will produce signal artifacts or fail to train at the higher resolution. Budget for quality cables — they are not optional at this res.
• Operating temperature ceiling is 40°C. Equipment rooms without active cooling or poorly positioned units near other heat sources can exceed this; verify ambient temperature at the switch location before commissioning.

The CK4-D404C is the right specification for a four-seat classified workstation environment — intelligence analysis, defense contractor multi-domain terminals, or any federal workspace where NIAP PP 4.0 is a contract requirement and quad-monitor productivity cannot be sacrificed for security compliance.