HPE ProLiant Compute XD685

Configurable systemConfigure to orderManufacturer documented

A complete rack server, not a graphics card. It holds eight AMD Instinct accelerators and two AMD EPYC processors, and is built for organisations training or serving large models on AMD silicon.

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Representative system image

Where does this sit?

Enterprise. Four to eight enterprise accelerators in a rack chassis, sized for production load rather than experiments. Typically bought by an enterprise ai or platform team. Datacentre or a well-provisioned rack.

Fit

Is this the right thing for you?

Who it's for

Enterprises standardising on AMD Instinct accelerators
Research groups with AMD-optimised workloads
Anyone building an eight-GPU training node without liquid cooling

What it runs

Large-scale model training
High-throughput inference
HPC and AI convergence

When it is the wrong answer

Offices — this is a datacentre machine and it is loud
Workloads written exclusively against CUDA without a porting plan

Where it goes: Datacentre or a well-cooled rack with 8U of space
Complexity: high
Cooling: Air cooled

Specification

What the numbers mean

Every figure below is explained in plain English. Switch to the technical view for the bare specification.

System

Form factor

8U rack, air-cooled eight-way GPU server

Processors

2x AMD EPYC 9004 / 9005 series

MeansThe general-purpose CPUs that feed and coordinate the accelerators.

Accelerators

Up to 8x AMD Instinct MI300X or MI325X (OAM)

MeansOAM is a server-only accelerator module. These cannot go in a desktop.

MattersAccelerator count and memory decide which models fit.

MemoryUnverified

DDR5, 24 DIMM slots per QuickSpecs — maximum capacity awaiting verification

Storage baysUnverified

NVMe / SAS / SATA SFF bays — exact count awaiting verification

NetworkingUnverified

OCP 3.0 slots plus PCIe Gen5 NIC options — exact port configuration awaiting verification

Cooling

Air-cooled

Power suppliesUnverified

Multiple redundant high-wattage PSUs — exact rating awaiting verification

Verification

Manufacturer documented — HPE ProLiant Compute XD685 QuickSpecs a00073553enw. Reviewed 2026-08-31.

Manufacturer source

Before you commit

Practical considerations

The things that catch people out after the hardware has already been ordered.

Air-cooled at this density means significant airflow and noise. Confirm your rack can take it.
AMD Instinct is an excellent choice where your software stack supports ROCm. Confirm that before ordering.

Completeness