Builder details $18k 4x Radeon R9700 local LLM rig
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A $18k workstation build pairs a Threadripper 9970x with 4x AMD Radeon R9700 AI Pro 32GB cards for 128GB total VRAM, each GPU undervolted under 210W on a 1600W PSU. It serves Qwen 3.8 Next flash/27b via a fork of Radiance for a 10-person startup.
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