RGBlink MSP 331U

The RGBlink MSP 331U Gen1 is a capture card in a black finned housing. It accepts HDMI 2.0 signals up to 4K60 and captures them to a computer over USB-C (USB 3.2, 5 Gb/s) without drivers at up to 4K30, or 1920 × 1080 at 240 fps. The HDMI 2.0 loop-through output passes the picture on to a monitor, and the 3.5 mm line-in mixes in a microphone.

The first generation of the MSP 331U capture card. Its connectors, input resolutions and audio are the same as on the second generation; it differs in the colour of the housing and in MJPEG capture, which tops out at 3840 × 2160 at 30 fps. Computers recognise it as a standard webcam and sound card (UVC 1.5, UAC 1.0), so it needs no drivers.

Connectors on two sides

The input side carries HDMI 2.0 with HDCP 2.3 and a 3.5 mm line-in for a microphone, wireless receiver or player. The output side has USB-C (USB 3.2), which carries picture and sound to the computer and also powers the card, a 3.5 mm headphone output and an HDMI 2.0 loop-through output for a monitor or TV.

Typical setup

Connect the source – a computer, games console or camera – to the HDMI input and a microphone to the line-in. Picture and sound go over USB 3.2 to a laptop running streaming software, the headphone output is for monitoring, and the HDMI loop-through output sends the same picture to a monitor, so the player watches the source directly rather than a preview on the computer.

Signal status light pipe

The light pipe on the side of the card shows the status at a glance: it pulses purple for about three seconds after power-on, glows red when there is no HDMI signal or audio at the input, runs green to the left when the card receives HDMI, and cyan to the right when it mixes HDMI audio with the line-in.

Mixing HDMI audio with the line-in

The card mixes audio embedded in the HDMI signal with the 3.5 mm line-in, and automatic gain control (AGC) keeps the level in check. With both sources in use, the ratio is 40 % HDMI to 60 % line-in; the microphone level is set on the connected device. Audio reaches the computer at 24-bit / 48 kHz.

Works with common software

Use the card in OBS, PotPlayer, VLC, XSplit VCam, CameraFi and vMix, in meeting apps such as Microsoft Teams, Tencent Meeting, DingTalk and Lark, and in any DirectShow, V4L2 or AVCaptureSession software. It needs a USB 3.0 port or newer – on USB 2.0, or with a USB 2.0 cable, it offers only low resolutions.

More information

The RGBlink MSP 331U is a high-performance USB capture card designed for gamers, streamers, and content creators. With ultra-low latency, 4K @ 60 Hz input, HDR support, and refresh rates up to 240 Hz, it delivers smooth, vibrant video. Its silent fanless design, plug-and-play operation, and multi-platform compatibility make it ideal for Windows, macOS, Linux, iPad, and major gaming consoles like PS5, Xbox, and Switch.

The RGBlink MSP 331U Gen1 sets a new standard in USB video capture performance. Featuring HDMI 2.0 input with HDCP 2.3, it accepts 4K video at 60 fps and RGB 4:4:4 signals, while handling lower resolutions and refresh rates up to 240 Hz. HDR support ensures richer colors and finer detail, and the 3.5 mm analog audio input allows seamless integration for voiceovers and live streaming.

Equipped with a USB 3.2 interface delivering up to 5 Gbps, the MSP 331U Gen1 guarantees stable, high-speed data transfer. Its adaptive power regulation allows 24/7 silent operation, complemented by a four-color dynamic light pipe for real-time status monitoring. Fully plug-and-play with UVC 1.5 and UAC 1.0 standards, it works flawlessly across Windows, macOS, Linux, iPad, and gaming consoles, supporting a variety of streaming and conferencing platforms. Compatible capture formats include RGB24, YUY2, NV12, I420, P010, and MJPG, making it ideal for gaming, live production, and multimedia content creation.

Key Features

• HDMI 2.0 input and HDMI loop-through output with HDCP 2.3, backward compatible
• 4K uncompressed video capture and live streaming
• Capture up to 3840×2160 @ 30 fps
• Supports RGB 4:4:4 8-bit 4K@60Hz, 4K@50Hz, 4K@30Hz, 2K@240Hz
• HDR for enhanced color and detail
• Audio capture output with 3.5 mm analog audio input/output
• USB 3.2 interface with 5 Gbps high-speed transfer
• UVC 1.5 & UAC 1.0 standards, driver-free plug-and-play
• Dynamic light pipe for real-time signal status display
• Silent fanless operation with adaptive power regulation