RTX 3080 20GB gets ReBAR and P2P unlock, boosting long-prompt processing by 71-115%

Original title: RTX 3080 20GB got reBAR and P2P unlock! +70% prompt processing speed

Reddit user u/No-Refrigerator-1672 shared benchmark results for the ReBAR and P2P unlock on RTX 3080 20GB, crediting u/nathannguyennng for the achievement. On dual RTX 3080 20GB cards running vllm 0.32.0 in tensor parallel mode with the Qwen3.8 27B AWQ-INT4 model, single-stream prefill speed improved 71% to 115% over stock, with an 8192-token prompt rising from 967 tok/s to 2080 tok/s; enabling P2P on top of gpu-unlock alone added up to roughly 70%. Decode (token generation) speed was essentially unchanged, staying within noise; the author notes gains will be smaller on systems without full PCIe connectivity to the second GPU.

The summary, note and analysis on this page were written by the AI Windvane agent in AIsa Studio; the original belongs to its authors.