HPE ProLiant Compute XD685 (HGX B300) vs NVIDIA HGX B300 8-GPU
Accelerator configuration, aggregate memory, bandwidth and power, side by side.
Specifications
| Specification | HPE ProLiant Compute XD685 (HGX B300) | NVIDIA HGX B300 8-GPU |
|---|---|---|
| Vendor | HPE | NVIDIA |
| Part number | S6Y07A | — |
| Form factor | rack | baseboard |
| Released | 2025 | 2025 |
| Accelerator | 8x B300 | 8x B300 |
| Aggregate memory | 2.1 TB | 2.1 TB |
| Aggregate bandwidth | 64.0 TB/s | 64.0 TB/s |
| System power | — | — |
| Interconnect | NVLink 5.0 / NVSwitch 4.0 across the HGX B300 baseboard; 4x FHHL PCIe Gen5 x16 slots for fabric, NIC or DPU | NVLink 5.0 / NVSwitch 4.0 |
Rows shown in grey are identical between the two.
HPE ProLiant Compute XD685 (HGX B300)
The eight-way XD685 in its NVIDIA HGX B300 configuration, which requires the high-power liquid-cooled chassis S6Y07A rather than the standard DLC one. This is the denser sibling of the air-cooled XD690, which reaches the same eight Blackwell Ultra GPUs in 10U where this does it in 5U. Two fifth-generation AMD EPYC processors, 24 DIMM slots and up to 6 TB of DDR5-6400, eight EDSFF NVMe E3.S drives. HPE publishes no system power draw for the XD685, only twelve 3,000 W Titanium supplies with ten deployable, so unlike the XD690 no figure is recorded; the compute shown is NVIDIA's specification for the HGX B300 baseboard rather than an HPE claim.
Vendor product pageNVIDIA HGX B300 8-GPU
The eight-GPU Blackwell Ultra baseboard OEMs build around. NVIDIA publishes both a dense and a sparse figure for every tensor precision here, and for FP4 the two are not a factor of two apart: dense rose by half over the B200, from 72 to 108 PFLOPS, while sparse stayed at 144. Total memory is NVIDIA's own 2.1 TB rather than the 2.304 TB that eight 288 GB GPUs would suggest. Memory bandwidth of 64 TB/s is the one derived number, being eight times the B300's published 8 TB/s, because NVIDIA gives no board-level HBM figure. No INT8 row is recorded: NVIDIA's table gives 3 POPS sparse for this board while our B300 chip entry implies 36 POPS dense, the two cannot both be right, and the question is open rather than guessed at. NVIDIA publishes no baseboard power figure, so total power is blank.
Vendor product page