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PCIe 4.0 x8/x8 vs x16/x16 for Dual GPUs: Does Bandwidth Choke Local LLM Tensor Parallelism?

📌 The Executive Verdict: Does PCIe 4.0 x8/x8 Choke Dual-GPU Inference? In dual-GPU workstations running local LLMs under tensor parallelism (such as Tensor Parallel size = 2 in vLLM or llama.cpp), PCIe 4.0 x8/x8 does NOT severely choke token generation . While a PCIe 4.0 x16 slot delivers ~31.5 GB…

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  1. 2026-10-12 15:30 · DEV Community — Machine Learning
    PCIe 4.0 x8/x8 vs x16/x16 for Dual GPUs: Does Bandwidth Choke Local LLM Tensor Parallelism?

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