HPE ProLiant Compute XD685 vs Supermicro AS-8125GS-TNHR: 8-GPU AI Server Comparison
Both the HPE ProLiant Compute XD685 and the Supermicro AS-8125GS-TNHR are dual-socket AMD EPYC, 8-GPU AI training nodes built for large-scale LLM and deep learning clusters. The XD685 leans on enterprise-grade integration, direct liquid cooling, and HPE's global support and GreenLake services, while the Supermicro 8125GS competes on configuration flexibility, NVLink/NVSwitch density, and aggressive price-performance. This comparison breaks down where each fits for buyers building GPU clusters at scale.
The short answer
For enterprises and public-sector buyers who need a fully supported, factory-integrated AI node with rack-scale liquid cooling, HPE services, and consistent lifecycle management, the HPE ProLiant Compute XD685 is the stronger choice. The Supermicro AS-8125GS-TNHR wins on raw price-performance, configuration breadth, and time-to-ship for teams with strong in-house infrastructure expertise. Pick the XD685 when support SLAs, TAA-compliant sourcing, and turnkey deployment matter; pick the 8125GS when budget per GPU-hour and DIY flexibility dominate the decision.
HPE ProLiant Compute XD685 vs Supermicro AS-8125GS-TNHR, head to head
Specifications side by side
- Form factor
- 5U (direct liquid cooling) or 6U (air cooled)
- 8U air cooled
- CPU
- 2x 5th Gen AMD EPYC (up to 96 cores each)
- 2x AMD EPYC 9005/9004 series
- GPUs
- 8x NVIDIA H200/B200/B300 or AMD MI300X/MI325X/MI355X
- 8x NVIDIA HGX H100/H200 (SXM5)
- GPU interconnect
- NVLink/NVSwitch (NVIDIA HGX) or Infinity Fabric (AMD)
- NVIDIA NVLink + NVSwitch
- Memory
- 24 DIMM slots, up to 6.1 TB DDR5
- 24 DIMM slots, up to 6 TB DDR5 (4800 MT/s)
- Storage
- 8x E3.S hot-swap NVMe
- Up to 12x 2.5" NVMe + 2x SATA (plus 4 optional NVMe)
- Networking
- PCIe Gen5 slots for high-speed NICs; designed for GPU-direct RDMA
- 8 NICs for GPU-direct RDMA (1:1 GPU:NIC ratio)
- Expansion
- 8x HHHL + 3x FHHL PCIe Gen5 x16
- Up to 8x PCIe 5.0 x16 LP + 4x PCIe 5.0 x16 FHFL
- Power supplies
- 6x 3000W @54V Titanium Plus (N+1)
- 6x (3+3) 3000W Titanium redundant
- Cooling
- Direct liquid cooling or air cooling
- Air cooling (heavy-duty fans)
- Management
- HPE iLO6, BMC, Redfish APIs
- ASPEED BMC, Redfish, IPMI
Where HPE ProLiant Compute XD685 wins
- Direct liquid cooling supports the highest-power Blackwell and Instinct accelerators at sustained clocks
- Enterprise-grade HPE support, Pointnext services, and proactive care with firm SLAs
- Silicon root of trust and supply-chain assurance for security-sensitive deployments
- Factory integration and rack-scale reference architectures shorten cluster deployment
- GreenLake consumption and TAA-compliant configurations for federal and SLED buyers
Where Supermicro AS-8125GS-TNHR wins
- Strong price-performance and typically lower acquisition cost per 8-GPU node
- Open, vendor-neutral building blocks that are easy to customize and service
- Dense NVLink+NVSwitch H100/H200 topology with 1:1 GPU:NIC for RDMA fabrics
- Generous 2.5" NVMe bay count for local scratch and data staging
- Fast availability and flexible BTO options through a broad integrator network
Which one should you buy?
Federal or SLED agency standing up an on-prem LLM training cluster with contract-vehicle procurement
Pick HPE ProLiant Compute XD685. HPE's TAA-compliant configurations, established federal support, and integration services align with public-sector compliance and SLA requirements.
Hyperscale or research team optimizing cost per GPU-hour with strong in-house ops
Pick Supermicro AS-8125GS-TNHR. Lower per-node cost and open building blocks let experienced teams maximize price-performance and customize the fabric.
Enterprise deploying high-power Blackwell or MI355X accelerators that need liquid cooling
Pick HPE ProLiant Compute XD685. Native direct liquid cooling sustains the highest-TDP next-gen accelerators and supports rack-scale DLC designs.
Lab building an H100/H200 NVLink cluster on a tight budget and timeline
Pick Supermicro AS-8125GS-TNHR. The dense air-cooled HGX H100/H200 platform with 1:1 GPU:NIC ships quickly at a competitive price.
Organization wanting consumption-based AI infrastructure with managed lifecycle
Pick HPE ProLiant Compute XD685. GreenLake and HPE services provide pay-as-you-grow economics and unified lifecycle management across the cluster.
Frequently asked
What is the main difference between the HPE ProLiant Compute XD685 and the Supermicro AS-8125GS-TNHR?
Both are dual-EPYC, 8-GPU AI training nodes, but the XD685 emphasizes enterprise integration, direct liquid cooling, and HPE support, while the 8125GS emphasizes open building blocks and price-performance. The XD685 also offers broader next-gen accelerator support including NVIDIA Blackwell and AMD Instinct MI355X, whereas the TNHR variant targets NVIDIA HGX H100/H200.
Which 8-GPU server offers better price-performance for AI clusters?
The Supermicro AS-8125GS-TNHR typically has a lower acquisition cost per node and is favored by teams optimizing cost per GPU-hour. The HPE XD685 carries a premium that is offset by factory integration, services, and consumption options, so total cost of ownership can favor HPE for organizations that value support and lifecycle management.
Does the HPE XD685 support both NVIDIA and AMD GPUs?
Yes. The XD685 supports eight NVIDIA H200, B200, or Blackwell Ultra (B300) GPUs, or eight AMD Instinct MI300X, MI325X, or MI355X accelerators, with direct liquid cooling available across the lineup and air cooling for NVIDIA H200.
What GPUs does the Supermicro AS-8125GS-TNHR support?
The AS-8125GS-TNHR is built for NVIDIA HGX H100/H200 8-GPU configurations with NVLink and NVSwitch. If you need AMD Instinct MI300X in a Supermicro 8U, that is the separate AS-8125GS-TNMR2 variant, so confirm the exact SKU for your accelerator choice.
How do the two servers compare on cooling for high-power AI workloads?
The HPE XD685 offers native direct liquid cooling in a 5U chassis (or 6U air-cooled), making it well suited to the highest-TDP Blackwell and Instinct accelerators at sustained clocks. The 8125GS is an 8U air-cooled design with heavy-duty fans, which is proven for H100/H200 but generally relies on facility-level cooling for the densest next-gen parts.
Which platform is better for management and AIOps?
Both expose Redfish APIs and a BMC, but HPE iLO6 plus optional GreenLake observability provides tighter enterprise lifecycle and fleet management. Supermicro offers SuperCloud Composer and Server Manager, which are capable but typically require more in-house tooling to reach the same managed-service experience.
Are these AI servers available TAA-compliant for federal and SLED buyers?
HPE maintains TAA-compliant ProLiant configurations with an established federal and SLED presence, and as an authorized HPE reseller we can source XD685 nodes for compliant procurement. Supermicro TAA-compliant builds are available through integrators on a per-configuration basis, and we can help validate compliance for your specific SKU.
Can you help us procure either server through GPC, SAP, FAR, or other contract vehicles?
Yes. As an authorized HPE, HPE Aruba Networking, and HPE Juniper Networking reseller, we can source the HPE ProLiant Compute XD685 and competing 8-GPU platforms, and we can quote and procure through common federal and SLED vehicles. Reach out with your accelerator, cooling, and fabric requirements and we will scope a compliant, supportable configuration.
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