Amd on doug.sh https://doug.sh/tags/amd/ Recent content in Amd on doug.sh Hugo -- gohugo.io en-us Sun, 08 Nov 2026 10:00:00 -0500 Six GPUs on One x16 Slot: R9700s and RTX 3090s Behind a PCIe Switch https://doug.sh/posts/six-gpus-one-x16-slot/ Sun, 08 Nov 2026 10:00:00 -0500 https://doug.sh/posts/six-gpus-one-x16-slot/ Doug Calobrisi llm ai self-hosted gpu pcie amd nvidia rocm vllm qwen linux Four Radeon AI PRO R9700s and two RTX 3090s behind a PEX88096 switch on one X570 slot: BIOS, kernel flags, ROCm and CUDA, and Qwen3.8-27B at 601 tok/s. PCIe Bifurcation vs PCIe Switches and Retimers for Multi-GPU Builds https://doug.sh/posts/pcie-bifurcation-switches-retimers/ Sun, 08 Nov 2026 09:00:00 -0500 https://doug.sh/posts/pcie-bifurcation-switches-retimers/ Doug Calobrisi pcie gpu nvidia amd linux self-hosted llm What bifurcation risers, retimers and PCIe switch (PLX) cards do for a multi-GPU box, with peer-to-peer copies at 54.7 GB/s inside a PEX88096 and what ACS costs.