L2L · Liquid-to-liquid
Trade shorthand for full direct-to-chip cooling that rejects into a facility water loop through CDUs: the highest-density retrofit path and the most disruptive to a live hall.
Current numbers
6.6xL2L heat-rejection capacity vs L2A, at under ~2x the cost at scale
120–142 kWL2L direct-to-chip density unlocked: GB200 NVL72 ~132 kW, GB300 ~142 kW per rack
~1.4 MW / CDUL2L CDU useful capacity; ~1 per 8–10 NVL72 racks at N+1; Google Deschutes row CDU ~2 MW