AVerMedia Live Gamer ULTRA 2.1 GC553G2 review

The AVerMedia Live Gamer ULTRA 2.1 GC553G2 is an external capture device with an HDMI 2.1 input/output path and a USB 3.2 Gen 2 Type-C host link. The US store identifies its retail listing as GC553G2 and gives a package SKU of 60GC553G20AJ. This is a distinct USB model from AVerMedia’s HDMI 2.0 GC553Pro and from the internal PCIe GC575/GC573 cards. Its headline advantage is substantial, but it depends on a specific Windows software, cable, port and computer arrangement rather than applying to every setup that can plug in the box.

4K144 is a Windows Streaming Center mode, not a universal maximum

AVerMedia documents capture up to 4K144 MJPEG through Streaming Center on Windows. The mode chart pairs that output with a 4K144 pass-through input; it does not say that 4K144 is available in every app. In particular, the current product page names 4K60 via OBS on Mac, not 4K144 via OBS. AVerMedia also lists the 4K144 Windows system floor separately: an Intel Core i5 12th-generation class CPU or later, RTX 3060 class GPU or later, and 16 GB memory. This is far more specific than a generic “USB capture” statement.

The external host link must support USB 3.2 Gen 2 at 10 Gbps for the full format table. AVerMedia’s chart reduces some format and frame-rate choices at 5 Gbps, even though a compatible lower-bandwidth capture path may still function. Use the supplied USB-C cable with a genuine 10 Gbps port; a USB-C connector alone does not establish that speed. The supplied package also includes an HDMI 2.1 cable, a 4-pole 3.5 mm audio cable and a quick guide.

Passthrough and recording have separate mode tables

The manufacturer lists HDR/VRR passthrough up to 4K144, 1440p240 and 1080p360, while capture reaches up to 4K144 in the specified Windows mode. Those are not interchangeable figures. The official GC553G2/GC575 mode matrix pairs each input pass-through resolution with particular capture outputs. For instance, its 4K144 input column allows different capture targets; the 1080p240 row is not a 4K144 capture, and 1440p240 is listed as a passthrough rate rather than a capture rate. The capture-format table also shows that 4K144 MJPEG needs the 10 Gbps connection, while the available 4K, ultra-wide, 1440p and 1080p modes vary by codec and USB bandwidth.

HDR recording is a Windows feature in the reviewed evidence. The matrix marks selected 4K30, 1440p60, 1080p120 and 1080p60 outputs as SDR-or-HDR; the higher 4K144 capture is not thereby a 4K144 HDR recording. The product page says HDR capture is unavailable on macOS. A source that sends HDR and a monitor that receives HDR do not prove that the captured file has HDR, so set the requested recording target explicitly.

Display and HDCP checks can decide whether it fits

AVerMedia warns that the actual high-refresh result depends on the HDMI 2.1 source, display input, cable, monitor mode and firmware. The product page notes that some monitors with built-in DSC may be limited to 4K120 passthrough. Its support FAQ for high-refresh selection also tells users to verify the monitor’s HDMI capability and DSC behavior rather than assuming a model name guarantees the mode. Check the exact display input and source output before purchase, especially if 4K144 or 1440p240 is the reason for choosing this device.

HDCP-protected video is not a supported capture source. A console or PC game output may be compatible while a protected streaming app is not; verify that the actual source can output unencrypted HDMI. For party chat, the GC553G2 has separate 4-pole 3.5 mm headset and gamepad input/output jacks. AVerMedia lists 5.1-channel capture on Windows, while LPCM itself remains stereo. Those ports and the included audio cable can simplify a console headset route, but they do not mean every app or audio format passes through as 5.1.

Mac and iPad are different operating plans

AVerMedia lists macOS 13/14 or later and provides a Mac OBS workflow. Its compatibility FAQ says GC553G2 can reach 4K60, 1440p60 and 1080p120 on the tested Mac setup; 4K60 MJPEG requires an M1/M2/M3 Ultra-class processor and updated firmware. This is a much lower mode ceiling than Windows Streaming Center’s 4K144 capture, and HDR capture is not available on Mac. The exact Mac model, cable/adapter and app version still matter.

The product page also lists iPadOS 17 or later, but the manufacturer material reviewed here does not give a product-specific iPad app or capture-mode table. That is a compatibility lead, not evidence that the Windows or Mac mode list applies to iPad. Confirm the exact app and source connection independently before treating iPad support as a complete recording workflow.

Bottom line: buy for the arrangement you can actually run

The GC553G2 is the more capable external AVerMedia option in this comparison when a Windows host, 10 Gbps USB port and 4K144-capable HDMI display chain all fit the job. It makes less sense to select it only for a “4K” label if your host is a Mac without Ultra-class hardware, your software requirement is OBS at 4K144, or your monitor’s DSC/HDMI implementation cannot sustain the intended passthrough. The smaller GC553Pro has an HDMI 2.0/5 Gbps ceiling but documents a simpler 4K60 path; the right choice depends on whether the display path or the recorded file is the constraint.

This is an evidence-based assessment of AVerMedia’s published specifications, support matrix, manual and US product listing, not an independent test. No measured latency, quality result or compatibility guarantee is claimed. Check the retail model and included cables, current firmware, USB port speed, display input and chosen software together; those are part of the real capture setup, not optional footnotes.