2x RTX Pro 6000 build maxes PSU

This is a power-delivery benchmark disguised as a thermal test: the machine’s ceiling is the PSU and circuit, not the cooling stack. That’s the real signal for anyone building serious on-prem inference rigs.

• –The setup pairs two 96GB RTX PRO 6000 Blackwell cards with a Threadripper Pro 7965WX, 256GB ECC RAM, and a 1600W Titanium PSU.
• –NVIDIA rates the cards at up to 600W, but the builder capped them lower to stay under the PSU’s hard limit during full CPU plus GPU load.
• –The air-cooled Noctua TR5 cooler appears to be doing its job: the CPU holds around 95C under combined heat soak without thermal throttling.
• –For local AI workloads, this says more about systems engineering than raw GPU throughput: airflow, board behavior, and power headroom now matter as much as the silicon.
• –It’s a useful real-world datapoint for inference teams sizing racks, circuits, and cooling before they ever think about model latency.