HPE Proliant Compute DL360 GEN12 MR932I-P 2SFF Side-by-side X4 PCIE SLOT1 Contro - P85804-B21

HPE P85804-B21 ProLiant DL360 Gen12 PCIe x4 Slot1 Controller

Overview

The HPE P85804-B21 is a PCIe slot controller designed specifically for the ProLiant DL360 Gen12 platform, enabling the MR932i-P configuration with a 2SFF side-by-side x4 PCIe Slot 1 topology. If you are expanding storage or peripheral connectivity within a DL360 Gen12 chassis, this is the OEM-matched component that keeps the build factory-correct — no adapter kludges, no firmware compatibility questions. The P85804-B21 (often searched as P85804 B21) is sourced as a genuine HPE part, ensuring it integrates cleanly with HPE's iLO management stack and Smart Array ecosystem.

Key Features

• PCIe Interface: The x4 PCIe electrical connection delivers the bandwidth needed for SFF drive backplane attachment in dense 1U configurations — appropriate for workloads where storage throughput matters and slot real estate is constrained.
• 2SFF Side-by-Side Configuration: Supports a dual Small Form Factor drive bay layout in a side-by-side arrangement, letting the DL360 Gen12 maintain its compact 1U footprint while still accommodating two independent drives — relevant when you need drive redundancy without expanding rack depth.
• DL360 Gen12 Platform Match: Engineered as a platform-specific component for the ProLiant DL360 Gen12 — not a generic PCIe riser. Using the correct OEM part avoids the HPE pre-boot validation warnings that appear when non-matched components are detected, and keeps the system eligible for HPE Pointnext support coverage.
• Low Component Weight (0.21 lb): At 0.21 lb, this controller adds negligible mass to the chassis — a non-issue for standard rack rail load ratings, but worth noting if you are working within a weight-sensitive edge or colocation deployment.

Integration & Compatibility

The P85804-B21 is validated for the HPE ProLiant DL360 Gen12 server. It pairs with the MR932i-P controller architecture and is designed for Slot 1 placement within that chassis. Before ordering, confirm your DL360 Gen12 configuration — the Gen12 platform introduced slot assignments that differ from Gen10/Gen11; verify against your server's QuickSpecs or system configuration guide to ensure Slot 1 is the correct target position for your build. For broader context on HPE server platform accessories and expansion options, review the HPE server catalog or browse network storage servers for compatible host platforms. If you are planning storage density for a surveillance or data workload, pairing this controller with the right SFF drives is the logical next step. Integration with server components like HPE-qualified SFF caddies ensures a clean, warranty-consistent build.

Frequently Asked Questions

Q: What server is the P85804-B21 compatible with?

A: The P85804-B21 is designed for the HPE ProLiant DL360 Gen12 platform, specifically supporting the MR932i-P 2SFF side-by-side x4 PCIe Slot 1 configuration. Confirm slot assignment against your server's QuickSpecs before installation.

Q: What interface does the P85804-B21 use?

A: It uses a PCIe interface — specifically an x4 PCIe connection for the Slot 1 position in the DL360 Gen12 chassis.

Q: How much does the P85804-B21 weigh?

A: The P85804-B21 weighs 0.21 lb, making it a lightweight component that adds negligible mass to the server chassis.

Q: Is the P85804-B21 compatible with Gen10 or Gen11 ProLiant servers?

A: Based on available evidence, the P85804-B21 is validated for the DL360 Gen12 specifically. Gen10 and Gen11 platforms use different slot configurations and controller architectures — verify HPE QuickSpecs for those generations before assuming cross-gen compatibility.

Q: Does the P85804-B21 include a warranty?

A: HPE provides a manufacturer warranty on genuine HPE parts. Specific warranty duration for this part number should be confirmed at time of purchase against current HPE policy for this SKU.

Karl Wilson

The P85804-B21 is one of those components that looks trivial on a parts list but causes real headaches when the wrong variant is ordered. It is a platform-matched PCIe x4 Slot 1 controller for the DL360 Gen12 — the specific slot position and SFF bay pairing matter, and HPE's Gen12 chassis does not forgive substitutions gracefully.

Technical Highlights:

• PCIe x4 Slot 1 Placement: Slot assignment in the Gen12 chassis is fixed by HPE's backplane design — this controller occupies Slot 1 specifically, which means ordering a variant intended for a different slot position will physically fit but may not initialize correctly under iLO.
• 2SFF Side-by-Side Bay Support: The side-by-side 2SFF layout this controller enables is distinct from stacked configurations — relevant if your DL360 Gen12 build targets NVMe or SAS SFF drives and you need the backplane attachment to match the physical bay orientation.
• 0.21 lb Component Weight: Lightweight at 0.21 lb, but do not let the form factor mislead you — this is a functional controller, not a passive bracket. It requires correct seating and firmware recognition to bring the attached bays online.

Deployment Considerations:

• Verify your DL360 Gen12 server's current slot population before ordering — if Slot 1 is already occupied by another controller or riser, this part will not have a home without a configuration change upstream.
• Evidence for this part is limited to distribution-feed attributes; pull the HPE QuickSpecs for the DL360 Gen12 to confirm MR932i-P controller compatibility with your specific chassis revision before committing to the build.

Best fit for a DL360 Gen12 deployment that requires the MR932i-P storage controller with 2SFF side-by-side drive access — specifically where the build spec calls out Slot 1 as the target position and the chassis is being configured from scratch or expanded with a matched storage topology.