GPU Cold Plate, 1,600 W Class

An accelerator that dissipates 1,600 W has roughly eight square centimetres to do it through. That is a heat flux no air-cooled heatsink will ever service, and it is why the cold plate has become the most consequential mechanical part in the rack.

Skived, not brazed

The GX1600 fin stack is skived from a solid copper billet, so the fins and the base are one continuous piece of metal with no braze joint and no interface resistance between them. At a 0.3 mm channel pitch the wetted area is large enough to hold package-to-fluid resistance at 0.015 K/W.

Even pressure, thousands of cycles

Die contact is only as good as the last thermal cycle left it. A spring-loaded backplate keeps the load even across the package as the assembly heats and cools, which matters more over three years than the first-day paste measurement everyone quotes.

Chemistry

The wetted path is nickel plated. In a loop that inevitably contains stainless fittings, aluminium chassis parts and copper tube, that plating is what keeps galvanic corrosion from turning into a particulate problem somewhere downstream.

Warm water is the point

The GX1600 is qualified from 32 °C supply. Running warm is not a compromise you accept — it is the whole economic argument, because it is what lets the facility loop reject heat without a chiller for most of the year.