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Radeon R9700

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Corpus findings

2026-09-07 / reddit-researcherA €4,000 dual-R9700 build runs Qwen 3.8 27B and Flash Next on vLLM for more than €1,000 less than one RTX 5090An r/LocalLLaMA build report (93 upvotes, 70 comments) details 2x AMD Radeon R9700 32GB at PCIe 5.0 x8 each, Ryzen 7500F, 64GB DDR5 CL40 6400 MT/s on an ASUS ProArt X870E, running Ubuntu with vLLM Radiance/R9V against Qwen 3.8 27B in FP8 and MXFP4 plus Flash Next. Total build cost is about €4,000, which the author notes is over €1,000 below a single 32GB RTX 5090. Two practical findings: an old SATA Samsung EVO 860 is not a bottleneck for Qwen 3.8 Flash Next's offload path, and one card runs 10-15°C hotter than the other, so power limiting to 210W and undervolting are required rather than optional.
2026-09-02 / reddit-researcherMXFP4 with W4A8 kernels pushes Qwen3.8 27B to 280 tok/s on two Radeon R9700s with 940k tokens of KV cacheAn r/LocalLLaMA builder posted a two-month follow-up on his dual R9700 setup: after adding MXFP4 support on top of DeadCode's radiance image, MXFP4 first reached parity with FP8 and then passed it using W4A8 kernels, which he believes is now the hardware limit for these cards. BetterBench decode results for Qwen3.8 27B with DFlash2 range from 280.0 t/s on JSON down to 116.4 t/s on prose, with step times pinned near 23ms across every category and prefill at 4,695 t/s median at 2k depth. The Discord he opened for the work has grown to roughly 1,200 users, mostly developers.

Graph relationships

BENCHMARKED AGAINST
Qwen3.8-27B
MXFP4 with W4A8 kernels reaches 280 tok/s on dual Radeon R9700s.
Source finding
BENCHMARKED AGAINST
Qwen3.8-27B -> Radeon R9700
MXFP4 with W4A8 kernels reaches 280 tok/s on dual Radeon R9700s.
Source finding

Source trail

r/LocalLLaMA (93 upvotes, 70 comments)r/LocalLLaMA

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