Frore’s LiquidJet Coldplate Claims 12°C Off Rubin – and a Third Less Coolant Flow

Frore Systems claims its LiquidJet coldplate reduces Nvidia Rubin GPU junction temperatures by 6 to 12°C compared with conventional direct-to-chip cooling, yielding a 10 to 25 percent gain in tokens per watt, and requires about 2 liters per minute of coolant on a 2,300W Rubin Max-P versus roughly 3.25 LPM for a standard coldplate. The company says the etched 3D jet channels target hotspots directly and handle up to 600 W/cm², scaling to Rubin Ultra and custom silicon above 4kW, while hyperscalers consider delidding GPUs for production use. The figures are vendor-provided and not independently verified.

Etched jet channels instead of straight microchannels, aimed squarely at the hotspots. Frore says the payoff is cooler silicon, more tokens per watt, and far less pumping. Cooling has quietly become the thing that decides how fast an AI accelerator actually runs, and Frore Systems is making an aggressive pitch on that front. Its LiquidJet coldplate, the company says, drops Nvidia Rubin junction temperatures by 6 to 12°C against a conventional direct-to-chip plate, and turns that headroom into a 10 to 25 percent gain in tokens per watt. Frore puts a roughly 10°C drop at about 15 percent more token generation. The interesting part is how it gets there. A normal coldplate is a flat sheet of parallel microchannels: coolant enters one side, picks up heat along the way, and leaves hotter and slower than it started. Everything downstream of the hottest part of the die is being cooled by water that has already done its job. LiquidJet throws that layout out. Frore etches short 3D jet channels using semiconductor manufacturing techniques and routes them according to the GPU’s actual power-density map, firing coolant directly at the hotspots in multiple stages rather than dragging it across the whole package in one pass. The flow number is the one to watch Buried under the temperature headline is a figure that matters more to anyone actually running a datacenter. On a Rubin Max-P at roughly 2,300W, Frore reckons LiquidJet holds the target junction temperature on about 2 litres per minute of coolant. A conventional coldplate needs around 3.25 LPM to do the same job. That is roughly a third less flow per GPU. Multiply it across a hall full of racks and it stops being a spec-sheet curiosity: smaller pumps, smaller manifolds, less parasitic power burned moving water around, and more thermal margin left before anything has to throttle. Frore also quotes hotspot handling up to 600 W/cm² at a 40°C inlet, and says the design scales to Rubin Ultra, Feynman and custom hyperscaler silicon north of 4kW. And then there is the delidding The detail that should raise eyebrows is what Frore says its customers are considering. Running a coldplate against bare silicon instead of through the integrated heat spreader removes a thermal interface and a chunk of resistance with it. Enthusiasts have been delidding CPUs for years and accepting the risk that comes with it. Doing it to a five-figure AI accelerator, in production, at scale, is a different proposition entirely, and it says a lot about how tight thermal margins have got that hyperscalers are apparently entertaining it at all. Worth keeping the usual caveat in view: these are vendor numbers, modelled and measured by the vendor, against an unnamed “conventional” baseline. Nobody independent has put a LiquidJet plate on a Rubin card and published results. The physics of jet impingement is sound and well documented, but the size of the win in a real rack, with real coolant temperatures and real fouling over time, is still an open question. Still, the direction is clear enough. When a GPU pulls two kilowatts, the cooler stops being an accessory and starts being part of the performance spec. Source: Tom’s Hardware https://www.tomshardware.com/pc-components/liquid-cooling/frore-claims-its-liquidjet-can-drop-nvidia-rubin-gpu-temperatures-by-10-c-can-also-boost-performance-by-15-percent-as-hyperscalers-eye-using-delidded-gpus-in-production-environments , with additional detail from Frore Systems https://www.froresystems.com/products/liquidjet-dlc-coldplate .