CoolIT unveils 4kW single-phase DLC Cold Plate: ready for NVIDIA GB300 Blackwell Ultra AI GPUs

CoolIT has just announced its latest liquid cooling cold plate, destined for high-powered data centers, capable of dissipating an incredible 1.4kW of heat.

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The liquid cooling specialist says that doubling the heat dissipation over current industry standards regarding single-phase Direct Liquid Cooling (DLC) solutions. NVIDIA is about to host it GTC (GPU Technology Conference) next week, where we should be introduced to its heavily beefed-up GB300 "Blackwell Ultra" AI GPU with a larger 288GB of HBM3E, and a much higher 1.4kW of power consumption... perfect for a new direct liquid cooling plate that can handle 4kW.

Kamal Mostafavi, VP of Engineering, said: "CoolIT continues to lead the industry in performance. We are thrilled to show silicon leaders that single-phase DLC will continue to be a key enabling technology with demonstrated capability for up to 4000W processors. Single-phase direct liquid cooling - known for being the most mature, reliable and scalable liquid cooling technology - is also more than capable of cooling ultra-high watt microprocessors for the foreseeable future".

• Read more: NVIDIA GTC 2025: GB300 AI GPU with 1.4kW power, new details on Rubin AI GPU

CoolIT explains: Single-phase DLC works by removing heat from semiconductors with water or a water-glycol mixture running through coldplates attached to the chips. It is the most widely deployed liquid cooling technology in the market today1 and the de facto liquid cooling standard for AI processors exceeding 1000W TDP2.

In its tests, CoolIT showed its coldplate capturing 97%+ of heat from a 4000W thermal test vehicle (TTV) with a flow rate of 6 litres per minute (LPM). This is equivalent to 1.5 LPM per kW, the semiconductor industry's recommended flow rate for high-wattage chips. Tests at a lower flow rate also showed excellent results.

CoolIT's 4000W coldplates also achieve an outstanding ultra-low thermal resistance of Tr<0.009 C/W while limiting the full flow loop pressure drop (including all fittings and QDs) to just 8 PSI.

Used for multiple server generations by most of the world's major server manufacturers, CoolIT's coldplates with Split-FlowTM technology delivers 30% better thermal and flow performance than standard coldplates with the added ability to provide targeted cooling to hot spots.