Independent Benchmarks Show Accelsius Two-Phase Direct-to-Chip Cooling Delivers 9°C Lower NVIDIA B200 Junction Temperatures Than Single-Phase in Warm-Water Conditions

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Accelsius, the leader in two-phase, direct-to-chip liquid cooling technology for AI and high-performance computing, today announced results from independent third-party benchmark testing demonstrating that two-phase direct-to-chip liquid cooling better supports NVIDIA’s goal of enabling global free cooling with warm facility-water temperatures. The results show that single-phase performance at 45°C facility water can be matched by Accelsius with 54°C inlet water temperatures. As AI infrastructure expands into hotter climates and operators seek to reduce energy consumption and local community impact, the ability to maintain GPU performance at higher facility water temperatures is becoming a critical requirement for purpose-built AI factories. Every 1°C increase in facility water temperature equates to approximately 4 percent in annual energy savings. By enabling operation with facility water temperatures beyond 50°C, NeuCool enables free cooling in most locations around the world for much of the year. Independent benchmarking was conducted by a third-party systems integrator using a commercially available eight-way NVIDIA B200 GPU server. The evaluation compared the server’s factory-installed single-phase direct-to-chip cooling system with Accelsius’ NeuCool two-phase technology across approximately 40,000 operating points under simulated AI workloads. By varying GPU core, high-bandwidth memory (HBM) and CPU power, the testing created a comprehensive comparison of thermal performance across realistic operating conditions. An additional advantage of two-phase direct-to-chip cooling is how well it capitalizes on higher facility water flow rates. Raising facility water flow from 1.5 liters per minute per kilowatt (LPM/kW) to 3.0 LPM/kW widened the thermal advantage over single-phase from 9°C to 14°C, enabling previously unattainable facility water supply temperatures of 59°C. Single-phase cooling does not realize comparable performance gains from increased facility water flow. Leading ecosystem players, from server OEMs to chip manufacturers, recognize the advantages two-phase will bring to future generations of data center operators. To measure the effects of two-phase, direct-to-chip cooling in warm water facilities, Accelsius has detailed these technical improvements in a whitepaper called “Warm-Water Ready: Benchmarking Two-Phase vs. Single-Phase Direct-t...

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