Iceotope raises $26m as AI rack densities push past what air cooling can do

Barclays Climate Ventures and Two Seas Capital led the British precision-liquid-cooling company’s Series B, with existing backers ABC Impact, Northern Gritstone, Edinv, and British Patient Capital all returning

Iceotope, the British precision-liquid-cooling company, has closed a $26 million Series B round to expand its product line and patent portfolio as the AI hardware cycle pushes rack power densities past the point where air cooling can keep up.

Two Seas Capital and Barclays Climate Ventures led the round, with existing backers Edinv, ABC Impact, Northern Gritstone, and British Patient Capital all participating again, the company said on Wednesday.

The pitch is timing as much as technology. Next-generation Nvidia accelerator platforms are driving per-rack power densities toward and beyond 1 MW, a level at which both conventional air cooling and direct-to-chip liquid loops fail to remove heat fast enough to keep silicon at sustainable operating temperatures.

Iceotope’s approach, which the ...