HPE DL385 GEN11 CPU 8P GPU PWR CBL MB - P57851-B21

HPE P57851-B21 DL385 Gen11 CPU 8-Pin GPU Power Cable

Overview

The HPE P57851-B21 is a factory-new, genuine HPE internal power cable engineered specifically for the ProLiant DL385 Gen11 platform. It routes supplemental power from the motherboard to GPU cards requiring an 8-pin auxiliary connector — a common requirement when provisioning GPU-accelerated workloads in the DL385 Gen11 chassis. If you are expanding GPU capacity in an existing DL385 Gen11 deployment or replacing a damaged cable during a field repair, the P57851-B21 (often searched as P57851 B21) is the HPE-sourced replacement that ensures proper connector keying, correct pin-out, and cable length matched to the Gen11 chassis internal routing.

Key Features

• Platform-Specific Fit: Designed exclusively for the HPE ProLiant DL385 Gen11 motherboard-to-GPU power path — cable length, connector keying, and routing conform to the Gen11 chassis geometry, eliminating the improvised adapter risk that comes with generic cables.
• 8-Pin GPU Auxiliary Power: Delivers the supplemental PCIe power that GPU cards require beyond what the slot provides. Without this cable installed, add-in GPU cards drawing above slot-rated wattage will not power on or will trigger chassis fault conditions.
• Lightweight Field-Replaceable Component: At 0.35 lb, the P57851-B21 is a straightforward field-swap item — no special tooling, no firmware involvement. Keep one on the spares shelf for any DL385 Gen11 site running GPU workloads.
• Genuine HPE Component: Sourced factory-new through distribution — not a grey-market or third-party substitute. HPE platform components carry HPE's standard cable and accessory warranty coverage.

Integration & Compatibility

The P57851-B21 is validated for the HPE ProLiant DL385 Gen11 server platform. It connects between the Gen11 system board and a GPU option card requiring 8-pin auxiliary power. Verify your DL385 Gen11 configuration guide or HPE QuickSpecs for the specific GPU options that require this cable — not all GPU configurations in the DL385 Gen11 require supplemental cabling, but those exceeding PCIe slot power budgets do. For HPE server infrastructure planning, review the broader HPE server and infrastructure catalog.

Frequently Asked Questions

Q: Which server platform is the P57851-B21 designed for?

A: The P57851-B21 is designed specifically for the HPE ProLiant DL385 Gen11 server platform. It routes CPU/motherboard-side power to GPU option cards requiring an 8-pin auxiliary connector within the Gen11 chassis.

Q: Can the P57851-B21 be used in other HPE ProLiant generations?

A: This cable is validated for the DL385 Gen11 specifically. HPE platform cables are chassis-generation-specific in connector type, pin-out, and length. Do not substitute across generations without verifying HPE QuickSpecs compatibility for your target platform.

Q: What is the weight of the P57851-B21?

A: The P57851-B21 weighs 0.35 lb, making it a compact, lightweight internal cable suitable for on-site sparing and field replacement.

Q: Is the P57851-B21 a genuine HPE component?

A: Yes. The P57851-B21 is a factory-new genuine HPE component sourced through distribution channels — not a grey-market or third-party substitute.

Karl Wilson

The P57851-B21 is one of those components that only matters when it is missing — specifically when you are provisioning a GPU option card in an HPE ProLiant DL385 Gen11 that exceeds PCIe slot power limits and the chassis posts a fault at POST. At 0.35 lb, it is a spares-shelf item, not a planning conversation, but skipping it during initial GPU installation is a common oversight on first-time DL385 Gen11 GPU builds.

Technical Highlights:

• Platform-Matched Connector: HPE cables for the DL385 Gen11 are keyed and dimensioned to the Gen11 chassis routing — no cable management improvisation needed during GPU add-in card installation.
• 8-Pin Auxiliary Power Path: Provides the supplemental PCIe power beyond what the x16 slot delivers, required by most mid-range and high-end GPU options in the DL385 Gen11 configuration matrix.
• Lightweight Sparing Profile: At 0.35 lb, the P57851-B21 is low-cost insurance for any DL385 Gen11 site running GPU workloads — stock one per chassis if GPU options are in scope.

Deployment Considerations:

• Confirm your specific GPU option card's auxiliary power requirement against HPE QuickSpecs before ordering — not every GPU configuration in the DL385 Gen11 requires this cable, only those drawing above PCIe slot-rated wattage.
• Do not cross-fit this cable into DL385 Gen10 or other ProLiant generations — chassis geometry, cable length, and connector orientation differ between platform generations and incorrect installation can damage connectors or prevent proper seating.

The P57851-B21 is the right order for any DL385 Gen11 deployment adding GPU compute capacity for AI inference, HPC, or GPU-accelerated virtualization workloads where the selected GPU card requires supplemental 8-pin auxiliary power.