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.
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Systems built on this design
3 configurationsBuilt on the NVIDIA HGX B300 8-GPU baseboard, so accelerator performance matches the reference. Chassis, CPU, memory and cooling are this vendor's own.
System Details
GPU Configuration
System Specifications
Precision Performance Breakdown
| Precision | System Performance | Per GPU | Efficiency |
|---|---|---|---|
| 0.010 PFLOPS | 1.3 TFLOPS | — | |
| 0.600 PFLOPS | 75.0 TFLOPS | — | |
| 9.000 PFLOPS | 1125.0 TFLOPS | — | |
| 18.000 PFLOPS | 2250.0 TFLOPS | — | |
| 18.000 PFLOPS | 2250.0 TFLOPS | — | |
| 36.000 PFLOPS | 4500.0 TFLOPS | — | |
| 108.000 PFLOPS | 13500.0 TFLOPS | — | |
| FP6 | 36.000 PFLOPS | 4500.0 TFLOPS | — |
All figures are dense. Vendors commonly headline the number, which is twice the dense one.
Powered by NVIDIA B300
This system utilizes 8 × NVIDIA B300 SXM 288GB GPUs, each delivering exceptional performance for AI and HPC workloads.
Per GPU TDP
1400W
Per GPU Memory
288 GB
Process Node
4nm
Architecture
Blackwell Ultra
Documentation & Resources
Official Datasheet
HPE ProLiant Compute XD685 (HGX B300) technical specifications
HPE Compute XD690 QuickSpecs (a50009220enw, V6)
HPE • 2026-07-06
Typical Use Cases
The HPE ProLiant Compute XD685 (HGX B300) runs 8× B300 GPUs over NVLink 5.0 / NVSwitch 4.0 across the HGX B300 baseboard; 4x FHHL PCIe Gen5 x16 slots for fabric, NIC or DPU, delivering 36.0 PFLOPS FP8 dense.