Six GPUs on One x16 Slot: 4x R9700 + 2x RTX 3090 Behind a PCIe Switch
bolts98 · reddit · 2026-11-09
Doug Calobrisi details wiring 4x Radeon AI PRO R9700 plus 2x RTX 3090 — six GPUs — into a single motherboard x16 slot using a PCIe switch, covering topology, bandwidth allocation, power and cooling pitfalls for building local AI compute on the cheap.
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