Accelsius

Overview

Accelsius builds NeuCool, a two-phase direct-to-chip cooling system for dense compute: refrigerant is boiled off the chip and condensed in a closed loop, so heat leaves the rack without chilled water inside the server. The vendor states it cools more than 4,500 watts per socket, uses a commercially available, non-conductive refrigerant that is ITE-safe, and lowers annual operating cost by 35% relative to single-phase direct-to-chip systems. The system is positioned for mission-critical and AI infrastructure, where air cooling runs out of headroom, and is sold through partners and direct contact rather than an online price list. The company is based in Austin, Texas.

Editorial verdict

The pitch is a chip-level retrofit rather than a new building: two-phase direct-to-chip removes heat at the source, which is the only way to keep adding density where air handling is already at its limit. The quoted figures, 4,500 watts per socket and 35% lower annual OpEx than single-phase, are vendor claims from a technology comparison, so ask for the modelling assumptions and a pilot before budgeting on them. A non-conductive refrigerant and closed loop reduce the water question inside the rack, but facility-side heat rejection still has to be planned. Fits an operator with AI density arriving sooner than a cooling plant upgrade.

Written by the GreenAIX editors from the recorded fields above. Vendors do not review or approve verdicts.

Use cases

• Cool racks beyond air-cooling limits
• Cut cooling operating cost in a dense AI hall
• Retrofit direct-to-chip cooling without water in the rack
• Plan high-density capacity in an existing facility

Sources

• Accelsius NeuCool
• Accelsius home