The Future Is Fanless: 100% Heat Capture for Liquid Cooled AI Servers

AI servers are hitting a thermal wall. Once a rack passes roughly 250 kW, the old split of liquid plus air starts to break down. A 70/30 setup still leaves 75 kW for air to carry away, and that turns into a cost and complexity problem operators may not want to own.

CoolIT’s answer is to push liquid almost all the way to the finish line. The company says its modular coldplate blocks can capture effectively all of the heat, leaving air below 1 percent of the load and making fanless operation possible. That is a big shift from the older model, where the processor got special treatment and everything else was left to air.

That older model does not hold up as processor thermal design power keeps rising. Heat is spreading into memory, networking, storage, and power components, and those parts do not all behave like CPUs and GPUs. Some run cooler than the processor case temperature. Others run hotter. Each one needs a different thermal approach, which is why CoolIT is using conductive plates, vapor chambers, heat pipes, thermal transfer plates, and riding coldplates rather than a single blunt instrument.

The harder part is turning all of that into one server loop that is reliable, quick to assemble, and practical in a rack. Connection quality, coolant routing, and integration time matter just as much as raw cooling capacity. CoolIT says its building blocks are already proven across six generations of fanless server designs, and its modeling puts full heat capture as the standard for flagship rack-scale products through 2028 as rack power climbs toward 1 MW.

The key point is not that 100 percent is a neat marketing number. CoolIT itself calls near-total capture the honest target, because strict perfection is almost impossible. But the direction is clear: as density rises, air becomes the awkward leftover, and liquid becomes the main event.