HPE NVIDIA GB300 NVL72 by HPE

HPE's build of NVIDIA's GB300 NVL72, a 48U rack holding 36 Grace processors and 72 Blackwell Ultra GPUs across eighteen compute trays, each tray carrying two Grace CPUs and four GPUs on two GB300 boards. Nine NVLink switch trays tie the 72 GPUs into one domain over fifth-generation NVLink, and each tray adds two ConnectX-8 ports at 800 Gbps and a BlueField-3 DPU. Power comes from eight 33 kW shelves onto a 50 V DC busbar, each shelf built from six 5.5 kW supplies. HPE is unusually precise about what the rack actually draws: 132 kW nominal thermal design power, around 155 kW electrical design power at peak, and a recommendation that data centres provision busways for 192 kW. The figure shown here is the 132 kW nominal. Cooling is direct liquid to cold plates on both CPUs and GPUs, fed by an in-row CDU rated at 1.3 MW that can serve up to eight racks. The rack measures 2495 by 600 by 1068 mm and weighs about 3,300 lb fully loaded. HPE publishes no accelerator memory total and no throughput figure; the only memory it states is 512 GB of LPDDR5X per Grace CPU, which is host memory rather than HBM.