ezcap401 Review: High-Refresh HDMI 2.1 Passthrough

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▲ DOCUMENTED QUIRKS
Site Score
4.2 / 5.0
Buyer Guidance: An ideal external solution for creators needing high-refresh HDMI 2.1 passthrough, provided they accept MJPG compression for 4K 144fps capture and platform-specific HDR limits on macOS.
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Mizex Audit Breakdown
Engineering & Core Performance (30%) 4.3 / 5.0
Build Quality & Physical Design (20%) 4.2 / 5.0
Thermal, Power & Acoustics (20%) 4.1 / 5.0
Reliability & Stability (20%) 4.2 / 5.0
Buyer Value (10%) 4.2 / 5.0
Score Rationale
Uncompromising HDMI 2.1 passthrough headlines this capture dock's composite score of 4.2, delivering zero-penalty 4K 144Hz and 1080p 360Hz monitor feeds with full variable refresh rate support. Engineering & Architecture (4.3) effectively leverages a USB 3.2 Gen 2 connection to deliver up to 4K 60fps in NV12 and high-framerate captures, though achieving 4K 144fps requires MJPG compression to fit the 10 Gbps interface. Build quality (4.2) offers a neat desktop form factor with well-spaced rear I/O and easily accessible front-facing analog audio ports. Thermal management (4.1) handles continuous high-bandwidth video streams through passive chassis dissipation without requiring a noisy internal cooling fan. Real-world reliability (4.2) is backed by driverless UVC stability and sub-50ms input latency, balanced against macOS limitations that preclude HDR recording. Buyer value (4.2) remains strong for multi-platform streamers seeking next-gen console and PC passthrough without the complexity of a dedicated internal expansion card.
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✔ Pros
  • Uncompromised HDMI 2.1 passthrough up to 4K at 144Hz, 1440p at 240Hz, and 1080p at 360Hz with HDR and VRR
  • High-framerate USB 3.2 Gen 2 capture reaching 4K at 60fps uncompressed NV12 and up to 1080p at 240fps
  • Driverless UVC compliance with responsive sub-50ms latency across streaming platforms
  • Comprehensive analog audio routing including dedicated 3.5mm line-in and CTIA headset connectivity
✖ Cons
  • Peak 4K 144fps recording relies on MJPG compression due to USB 10 Gbps bus bandwidth limits
  • HDR video capture is not supported under macOS
  • Demanding host PC hardware requirements for decoding 4K 144fps capture streams

Overview

Bridging the gap between high-refresh gaming displays and external capture setups often forces compromise, but HDMI 2.1 passthrough allows competitive gamers to preserve their display pipelines while streaming. With passthrough support reaching up to 4K at 144Hz, 1440p at 240Hz, and 1080p at 360Hz alongside variable refresh rates and high dynamic range, current-generation consoles and gaming PCs feed zero-penalty video directly to monitors. In everyday practice, players retain fast refresh rates and low display latency without having to downscale their output or settle for standard 60Hz limitations.

The hardware architecture relies on a USB 3.2 Gen 2 Type-C interface operating under standard UVC protocols, delivering driverless plug-and-play connectivity on Windows 10, Windows 11, and modern macOS versions. To manage bandwidth across the 10 Gbps connection, recording modes are structured around format requirements: uncompressed NV12 tops out at 4K at 60fps and 1440p at 144fps, whereas capturing high-framerate 4K at 144fps relies on MJPG compression and a capable host processor. Sub-50ms latency ensures tight responsiveness between the gaming action and recording software, while front-mounted 3.5mm line-in and headset jacks streamline party chat and voice monitoring without additional splitters.

Housed in a compact desktop enclosure measuring 5.04 x 3.62 x 1.10 in (128 x 92 x 28 mm), the device relies on passive chassis thermal dissipation to manage heat during prolonged recording sessions without mechanical fan noise. While Windows users enjoy unrestricted access to the full suite of video formats and HDR recording capabilities, macOS users face software constraints that disable HDR recording. Even with these system-specific trade-offs and the compression required for peak resolution capture, the unit provides a flexible external solution for creators seeking high-refresh gaming passthrough without installing internal PCIe expansion cards.

Technical Specifications

Brand ezcap
Model ezcap401
Host Interface USB 3.2 Gen 2 Type-C (10 Gbps)
Video Input HDMI 2.1
Video Passthrough HDMI 2.1
Max Passthrough Resolution Up to 3840x2160 at 144Hz HDR/VRR, 2560x1440 at 240Hz HDR/VRR, 1920x1080 at 360Hz HDR/VRR
Max Recording Resolution (USB 3.2 Gen 2) 3840x2160 at 144fps (MJPG), 60fps (NV12); 2560x1440 at 144fps; 1920x1080 at 240fps
Supported Video Formats MJPG, NV12, YUY2, RGB24, P010
Audio Inputs HDMI, 3.5mm Line In (3-pole TRS), 3.5mm Headset Mic (4-pole CTIA)
Audio Outputs HDMI, 3.5mm Headset Audio (4-pole CTIA)
Passthrough Features HDR, VRR (Variable Refresh Rate)
Latency < 50ms
Driver Architecture UVC (USB Video Class) Plug-and-Play
Supported Operating Systems Windows 10 / 11 (64-bit), macOS 13 / 14 or later
Dimensions 5.04 x 3.62 x 1.10 in (128 x 92 x 28 mm)
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Primary Sources & Audited Citations

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At a Glance

How reliable is the ezcap401 Review: High-Refresh HDMI 2.1 Passthrough according to Mizex audits?
Mizex Composite Score: 4.2 / 5.0 ▲ DOCUMENTED QUIRKS

An ideal external solution for creators needing high-refresh HDMI 2.1 passthrough, provided they accept MJPG compression for 4K 144fps capture and platform-specific HDR limits on macOS.

What are the known quirks or drawbacks of the ezcap401 Review: High-Refresh HDMI 2.1 Passthrough?

Our reliability audit identified the following documented caveats:

  • Peak 4K 144fps recording relies on MJPG compression due to USB 10 Gbps bus bandwidth limits
  • HDR video capture is not supported under macOS
  • Demanding host PC hardware requirements for decoding 4K 144fps capture streams
What are the key engineering highlights of the ezcap401 Review: High-Refresh HDMI 2.1 Passthrough?

The top strengths recorded in our evaluation include:

  • Uncompromised HDMI 2.1 passthrough up to 4K at 144Hz, 1440p at 240Hz, and 1080p at 360Hz with HDR and VRR
  • High-framerate USB 3.2 Gen 2 capture reaching 4K at 60fps uncompressed NV12 and up to 1080p at 240fps
  • Driverless UVC compliance with responsive sub-50ms latency across streaming platforms
  • Comprehensive analog audio routing including dedicated 3.5mm line-in and CTIA headset connectivity
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