Running SXM2/SXM3/SXM4 Nvidia Data Center GPUs in Consumer PCs (Archive.org)
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This was really popular a few months ago but unfortunately it's nearly impossible to find SXM4 A100 40g gpus on eBay for anything less than their retail price nowadays.
[1] https://github.com/l4rz/running-nvidia-sxm-gpus-in-consumer-...