When Nvidia announced its Rubin series of GPUs in March, it also dropped a bomb: racks built with the Ultra version of the chip, which is expected to be released in 2027, could draw up to 600 kilowatts of electricity. That’s nearly twice as much juice as some of the fastest EV chargers can deliver today. As data center racks become that power-hungry, one of the biggest hurdles will be figuring out how to keep them cool. One startup thinks stacks of metal are the answer. Alloy Enterprises has