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A €4,000 dual-R9700 build runs Qwen 3.8 27B and Flash Next on vLLM for more than €1,000 less than one RTX 5090
An 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.
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