Powering 8 GPUs from one x16 slot: inside a dual-switch PCIe expansion board
TheZachMueller · x · 2026-10-10
A teardown of an 8-GPU expansion board with two PCIe switches, driven by a single x16 slot. Direct-connect via two x16-to-4x x8 MCIO cables vs. cascade via one cable; the board offers 104 PCIe lanes, with 144-lane boards ($1000 more) giving more P2P budget between groups.
Related event: Teardown: Dual-Switch PCIe Board Drives 8 GPUs From a Single x16 Slot(8 posts)→
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