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      <title>Debugging PCIe Link Retraining on an x8/x8 Splitter with Two RTX 3090s</title>
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      <pubDate>Sun, 27 Sep 2026 00:00:00 +0000</pubDate>
      <guid>https://doug.sh/posts/pcie-splitter-rtx-3090/</guid>
      <dc:creator>Doug Calobrisi</dc:creator>
      <category>llm</category>
      <category>ai</category>
      <category>self-hosted</category>
      <category>gpu</category>
      <category>pcie</category>
      <category>nvidia</category>
      <category>vllm</category>
      <category>claude-code</category>
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      <description>Two RTX 3090s on a bifurcated x8/x8 splitter hung vLLM with timeouts and GPU errors. The fix was two PCIe register bits and a gen3 lock at boot.</description>
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