I wrote a custom CUDA inference engine to run Qwen3.5-27B on $130 mining cards

I bought four NVIDIA CMP 100-210 cards off the secondhand market for about $130 each. They are ex-mining cards based on the Volta GV100 die — same silicon as the V100 — with 16 GB of HBM2 each. On paper, four of them give me 64 GB of HBM2 for the price of a single used 3090. In practice, NVIDIA had crippled them in hardware. The throttle The CMP 100-210 has its tensor cores throttled 64×. HMMA latency is stretched from 8 cycles to 512. cuBLAS WMMA caps out at about 5 TFLOP per card. PCIe is lock