Pro Dual-GPU 70B

Why this build

This is the most capable consumer-hardware configuration for teams that need Llama 3.3 70B at Q4 quality with stable multi-user throughput. Two RTX 4090s deliver 48 GB of VRAM and tensor-parallel decode, sustaining 20–35 tok/s on 70B under concurrent load — enough for a small team running real workloads rather than experiments. The premium component choices (1600W PSU, high-airflow case, 360mm AIO) reflect that this rig runs both GPUs at sustained TDP for hours at a time. Server-grade cooling is not optional at this power envelope. At $12,000 all-in, this build competes with cloud GPU costs: a single H100 node runs $2–4/hr, so breakeven versus cloud is roughly 3,000–6,000 hours of use. It makes financial sense for teams with predictable, steady utilization. It doesn't make sense for occasional use or teams whose workloads are spiky — cloud is cheaper for burst-only patterns.