2x RTX 6000 build during an extended bench test

Reddit r/LocalLLaMA / 4/26/2026

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A builder documented an extended bench test of a dual RTX 6000 system, running the CPU at 100% while both GPUs were capped at about 535W.
The setup was pushed close to a 1600W 80+ Titanium PSU limit, drawing roughly 1650W from the wall during the load test.
The goal was to validate how well the air-cooled HX CPU cooler handles sustained full-load conditions, even with hot GPU exhaust directed toward it.
Despite the heavy cooling challenge, the CPU reportedly stabilized around ~95°C for long cruising periods, suggesting thermals were manageable under the test conditions.
The builder concluded that the current practical constraints are more about available power and electrical limits than cooling performance.

2x RTX 6000 build during an extended bench test

CPU at 100% and both GPUs at 535w cap. Recorded for noise and thermals documentation.

This is as loaded as I can get it on the 1600w titanium PSU. Pulling ~1650w at the wall.

People were interested in how the air cooled HX on the CPU would hold up so wanted to document. Cruises at about 95c even with the GPUs going nuts.

Had to cap GPUs around 535w for the test, that was just being safe with the PSU ceiling (got within 50w of the PSU hard cap) and I wanted to put maximum emphasis for this test on the CPU cooler under full load at the full 350w draw with GPU exhaust hitting it.

It genuinely holds up like a champ. It feels like my limits with this build at this point are power not thermals.

Also thanks to everyone in this community for helping me and discussing the build in my last post. Your feedback was super valuable and appreciated. This thing is a monster.

submitted by /u/Signal_Ad657
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