Local Inference Performance Impacted by PCIe and Hardware Variables
Sentdex · x · 2026-07-03
Sentdex points out that local LLM deployment involves numerous hardware and software variables, making benchmark results highly configuration-dependent. For instance, despite having a PCIe 4.0 motherboard, using a riser cable caused signal degradation, dropping actual speeds to PCIe 3.0. Upgrading to PCIe 5.0 could roughly double vLLM tensor parallelism (TP) throughput, while pipeline parallelism is less affected. Additionally, increasing the memory fraction can also boost performance.
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