$IREN Hybrid DLC + RDHx Cooling @CernunnosCap posts can a good place to find misconceptions that to be clarified. Here he states that Horizon 1 GB300 is only using Motivair RDHx cooling. However, Hybrid DLC + RDHx Cooling is known to people who actually work in the industry (1). DLC (Direct Liquid Cooling) cools the higher heat GPUs and CPUs. RDHx (Rear Door Heat Exchange) cools the Networking, Management, Storage equipment which has lower cooling requirements. The design tradeoff is that cold plates have very tiny channels and the to create enough flow volume, the dense cooling fluid needs to move very fast which means high pressure on the pipes. These is the steel pipes you see in the H1 liquid cooling picture. High pressure means more maintenance and operational monitoring overhe
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