EPYC 8-channel vs Ryzen DDR5: how much does CPU matter for local LLM coding?
SKX007J1 · reddit · 2026-10-15
The author is deciding between two systems for running Strata Coder (quantized Qwen3.8-Flash-Next) locally with OpenCode: an EPYC 7532 server (32C Zen 2, 128GB DDR4 8-channel, 171 GB/s) and a Ryzen 9 9950X3D (16C Zen 5, 96GB DDR5-6000, 96 GB/s but faster cores and AVX-512), both with an RTX 3090. They plan to benchmark prompt processing vs generation speed, GPU expert-cache hit rates, and whether CPU performance or memory bandwidth dominates, plus how quantization level (IQ1M vs IQ3S) changes results. Asking the community for existing benchmark data.
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