AMD EPYC 7702 + 4x RTX 3090 (partial GPU offload, DeepSeek MoE experts on CPU RAM)

Hybrid build: four RTX 3090s (96GB of VRAM) are present, but the 671B model does not fit in VRAM, so decode speed reflects CPU RAM bandwidth and the machine is modelled as a CPU entry per this project's bottleneck convention. TDP and bandwidth describe the CPU and RAM subsystem only, with GPU power not summed in. 64-core EPYC 7702 on a Gigabyte MZ32-AR0. Bandwidth is computed as 8ch x DDR4-2400 x 8 bytes; the channel count is not stated by the source and standard Rome 8ch is assumed. The $7,700 used rig total breaks down as CPU ~$650, SP3 board ~$510, 8x32GB DDR4-2400 ECC RDIMM ~$1,200, and four used RTX 3090s ~$5,040, so the GPUs are about 65% of the cost. Ancillary items (PSU, risers, frame; ~$263 together) are rough estimates. No new figure: a Rome CPU has no new-retail channel, and used cards are the only realistic sourcing route.