A while back, boards salvaged from defective Xbox Series X|S processor-kits started surfacing online featuring eight Zen 2 cores and a disabled iGPU along with 8-16GB of GDDR6 memory. These motherboard-CPU kits come with the AMD A77E Fusion Controller HUB (FCH) which is used in AMD APUs (and most likely the PS5 and Series X|S as well), and Realtek ALC897 audio which supports spatial sound via 7.1 sound playback.
In terms of I/O, the board comes with three USB 3.2 Gen 2 (10 Gbps) ports, one USB 3.2 Gen 1, and four USB 2.0 at the back which is quite impressive for a budget board. At the front panel, it features a USB3 2x Gen1 port and an audio connector. Additionally, the kit can be paired with a discrete graphics card, with AMD recommending the Radeon RX 590 or the GTX 1060 as the upper limit. Using more expensive cards can lead to bottlenecks in the PCIe bus as it features an x16 Gen 2 slot which is quite a bit slower than Gen 3 and Gen 4.
What makes it very likely a discarded Xbox Series X|S kit is the inclusion of GDDR6 memory (16GB of it), eight Zen 2 cores, and the limited PCIe I/O options. Generally, GDDR6 is more expensive than DDR4 (and faster too), and the lack of full-fledged Gen 3 or Gen 4 PCIe connectors means that the processor wasn’t designed to leverage an external graphics card. A single x16 PCIe 2.0 slot can support speeds up to 8 GB/s, and the lack of NVMe support means that the board is also hitting the limit with the GPU.
The Series X|S has an uncompressed I/O speed limit of 2.4 GB/s which shouldn’t post any problems with this configuration.
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