Hitachi cold plate eyes 30% cooling power cut

Hitachi's prototype targets a specific bottleneck in AI data centers: the heat thrown off by GPUs. As GPUs generate more heat and are packed in greater numbers, the pumps, chillers and cooling towers that dump that heat outdoors carry a heavier load, and power consumption climbs with it. Hitachi's answer is to change the geometry inside the cold plate. Rather than running coolant along the GPU face, its "U字トンネル流路" drives fluid in the thickness direction toward the heat-generating parts, then turns it back toward the outlet. Because the incoming cold coolant and the warmed outgoing coolant stay apart, the mixing that degrades cooling performance is suppressed. Hitachi also says it shortened each channel to reduce friction and arranged thousands of micro-channels in parallel, preserving flow area within the same cold plate size. The company says this balances high cooling performance with low pressure loss, and lets it cool GPUs with higher-temperature coolant, so the temperature difference with outside air can be used to dissipate heat more efficiently. That is the basis for the expected 30% cut in cooling power. Whether that figure holds in real data centers, and when the design reaches customers, is not stated in the announcement.