AnalysisDevelopersNovember 8, 2026

Six GPUs run on one x16 slot via Broadcom PCIe switch

Read original source →doug.sh

Four Radeon AI PRO R9700s (32 GB each) plus two RTX 3090s share one gen4 x16 link through a Broadcom PEX88096 switch on a Ryzen 9 3900X board. With TP4 on the R9700s, Qwen3.8-27B prefills a 32k-token prompt at ~4,700 tok/s and serves 601 tok/s output across 16 clients.

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