HPE S4A91C NVIDIA 4-WAY NVLINK Bridge FOR H200

HPE S4A91C NVIDIA 4-Way NVLink Bridge for H200

Overview

The HPE S4A91C is an NVIDIA 4-Way NVLink Bridge designed for use with H200 series GPUs in high-density compute environments. Weighing just 0.97 lb, this compact interconnect component is sourced factory-new through commercial distribution channels. If you are building or expanding a multi-GPU compute node around H200 hardware, the S4A91C provides the physical NVLink interconnect infrastructure required for 4-way GPU topologies.

This component is classified under UNSPSC code 43211600 (computer servers and workstations) and originates from CN (China). It is intended for professional integrators and data center architects provisioning HPE-based H200 GPU systems.

Key Features

• 4-Way NVLink Topology: Designed specifically to bridge four NVIDIA H200 GPUs within a single node — the physical prerequisite for enabling high-bandwidth GPU-to-GPU communication in demanding AI and HPC workloads where inter-GPU bandwidth is a deployment bottleneck.
• Lightweight Form Factor (0.97 lb): At under one pound, the S4A91C adds negligible chassis weight, keeping overall node mass manageable during rack installation and servicing — relevant in dense configurations where every pound of top-of-rack load matters.
• Factory-New, Genuine Component: Sourced through commercial distribution — no grey-market, no parallel imports. Correct for HPE H200 platform builds where component provenance directly affects warranty and support eligibility.
• Commercial-Grade Build: Designed for the operational demands of 24/7 data center and AI compute environments, not consumer or prosumer GPU configurations.

Integration and Compatibility

The S4A91C is specifically identified as a 4-Way NVLink Bridge for the NVIDIA H200 GPU family within HPE server platforms. Before ordering, confirm compatibility with your exact HPE server chassis and H200 GPU configuration through HPE's official product compatibility resources. NVLink bridge selection is topology-specific — the wrong bridge (wrong way-count or wrong GPU generation) will not seat or function correctly. Integrators provisioning HPE compute systems should cross-reference this part number against the HPE QuickSpecs for your target server platform.

This component is appropriate for architects designing high-performance compute nodes where multi-GPU NVLink connectivity is a build requirement. If your deployment requires 2-way NVLink bridging rather than 4-way, or targets a different GPU generation such as H100, verify the correct HPE part number before procurement — NVLink bridges are not interchangeable across GPU generations or bridge configurations.

Frequently Asked Questions

Q: What is the HPE S4A91C used for?

A: The S4A91C is an NVIDIA 4-Way NVLink Bridge for H200 GPUs, used to physically interconnect four H200 GPUs within an HPE server node to enable NVLink GPU-to-GPU communication.

Q: How much does the S4A91C weigh?

A: The S4A91C weighs 0.97 lb.

Q: Where is the HPE S4A91C manufactured?

A: The S4A91C is manufactured in China (CN).

Q: Is the S4A91C compatible with NVIDIA H100 GPUs?

A: The S4A91C is specifically identified as a bridge for H200 GPUs. NVLink bridges are generation-specific — verify compatibility with H100 configurations through HPE QuickSpecs before ordering.

Q: Can I use the S4A91C for a 2-way NVLink configuration?

A: The S4A91C is designed for 4-way NVLink topology. For 2-way configurations, a different HPE NVLink bridge part number would be required.

Karl Wilson

The HPE S4A91C comes in at 0.97 lb — light for what it does, which is provide the physical NVLink interconnect layer across four H200 GPUs in a single node. If you are sizing an HPE H200-based AI compute build, this bridge is the hardware prerequisite before any NVLink topology becomes available at the software level.

Technical Highlights:

• 4-Way NVLink Bridge: Enables the physical interconnect for four H200 GPUs — without this component seated correctly, multi-GPU NVLink communication is not possible regardless of driver or software configuration.
• 0.97 lb Component Weight: At under one pound, the S4A91C is easy to handle during node assembly and adds minimal load to the chassis — practical for technicians installing or swapping components in tight rack environments.
• H200-Specific Design: NVLink bridges are not cross-generational. The S4A91C is identified for H200 — using a bridge from a prior generation (H100 or A100) in an H200 slot is a mismatch that will surface during physical installation, not during software provisioning.

Deployment Considerations:

• Confirm the exact HPE server chassis and H200 GPU count before ordering — 4-way NVLink topology requires the right physical slot configuration in the target platform. HPE QuickSpecs for your server model is the authoritative source here.
• Evidence for this SKU is limited to distribution feed attributes. For detailed installation guidance, thermal clearance requirements, and slot alignment specs, reference HPE's official QuickSpecs documentation for the target server before deployment.

The S4A91C is the right procurement target for data center architects commissioning HPE H200 4-way GPU nodes for AI training or large-scale HPC workloads where NVLink inter-GPU bandwidth is a hard requirement of the workload architecture.