CoolIT Systems Demonstrates 15kW Coldplate for GPU Cooling

CoolIT Systems demonstrated a 15kW single-phase direct liquid cooling (DLC) coldplate design at Computex 2026, according to the company's press release and reporting by DataCenterDynamics and StorageReview. CoolIT says the design delivers nearly 4x the capacity of its previously demonstrated 4kW coldplate, announced in March 2025, and more than 10x the cooling required by current-generation AI GPUs.

Per CoolIT's materials and trade coverage, the coldplate is based on the company's Split-Flow microchannel architecture and was validated on a thermal test vehicle using a standard water-glycol coolant at 1.2 L/min/kW, with system-level performance suitable for 45C warm-water environments. The company positions the result as proof that single-phase DLC can scale to future ultra-high-density accelerators rather than as a shipping specification for deployed racks.

Single-phase DLC moves heat from silicon into a liquid loop through engineered microchannels without phase change, and raising coolant supply temperatures toward 45C is a common way to improve facility efficiency and enable heat reuse. The headroom is relevant because next-generation accelerators run hot: DataCenterDynamics reports Nvidia Blackwell GPUs can draw up to 1,200W and Vera Rubin-class parts reach TDPs near 2,300W. A validated 15kW coldplate suggests single-phase architectures may remain viable for a broader set of high-power devices, potentially delaying the need for two-phase or full-immersion cooling in some deployments.

• •Independent, third-party thermal validation beyond vendor test vehicles.
• •System-level demonstrations (rack, CDU and server integrations) and coolant-loop and connector standards in customer trials.
• •Server OEM and hyperscaler integration announcements referencing compatibility with 45C supply-temperature single-phase DLC.