HPE DL380 G12 1XG4 Retimer B1/3 DAC - P77492-B21

HPE P77492-B21 ProLiant DL380 Gen12 1xG4 Retimer B1/3 DAC

The HPE P77492-B21 is a factory-new, genuine retimer and direct-attach copper (DAC) component designed specifically for the ProLiant DL380 Gen12 (G12) server platform. Positioned in the B1/3 slot configuration, this PCIe Gen 4 retimer supports signal integrity on high-speed interconnects within the DL380 G12 chassis — a component class that matters when you're pushing Gen 4 bandwidth across longer PCB traces or riser configurations where signal degradation would otherwise cap effective throughput. If you're expanding, repairing, or configuring a DL380 Gen12 deployment, the P77492-B21 is the HPE-sourced part for that specific slot and generation.

Overview

Retimers on Gen 4 platforms do real work: they clean and re-drive PCIe signals to maintain eye-opening compliance at the receiver, which matters in dense server chassis where trace lengths push the limits of raw signaling. The G12 generation of ProLiant DL380 servers moved to PCIe Gen 4, doubling the per-lane bandwidth of Gen 3. Maintaining signal integrity at that speed requires active retiming on certain interconnect paths — this is that component. The B1/3 designation corresponds to a specific riser or slot pairing within the DL380 G12 architecture; verify your chassis riser map and HPE Quickspecs before ordering to confirm the correct retimer position for your configuration.

Key Features

• PCIe Gen 4 Signal Retiming: Active retiming re-clocks and re-drives high-speed signals within the DL380 G12 chassis, preserving link integrity at Gen 4 speeds where passive copper traces alone would introduce bit-error-rate issues at scale.
• Platform-Specific Design (DL380 G12, B1/3 Slot): Engineered for one platform and one slot position — not a generic PCIe component. Using the correct HPE-sourced retimer ensures compatibility with HPE firmware and platform validation, reducing risk in production server builds.
• Factory-New Genuine Component: Sourced as a factory-new HPE part — not refurbished, not pulled. For data center infrastructure where component provenance matters for warranty and support coverage, genuine new is the right call.
• Compact Form Factor (2.69 lb): At 2.69 lb, this is a sub-board or riser-class component sized for tool-assisted installation within the DL380 G12 chassis — not a standalone card requiring a full PCIe slot of its own in most configurations.

Integration & Compatibility

The P77492-B21 is validated for the HPE ProLiant DL380 Gen12 platform. It is not a universal retimer — do not substitute it into DL380 G10/G10+/G11 or other ProLiant families without confirming HPE Quickspecs compatibility. For enterprise server builds and data center deployments, cross-reference the DL380 G12 Quickspecs document and your specific riser kit to confirm the B1/3 position applies to your chassis configuration. If you're sourcing this for a data center networking or compute expansion project, pair it with the correct HPE riser kit and PCIe Gen 4 expansion cards validated for the G12 platform. For server components and riser accessories, verify slot mapping before installation. Country of origin: China (CN).

Frequently Asked Questions

Q: What server platform is the HPE P77492-B21 compatible with?

A: The P77492-B21 is designed for the HPE ProLiant DL380 Gen12 (G12) server. It targets the B1/3 slot/riser position within that platform. It is not validated for earlier DL380 generations (G10, G11) — confirm compatibility via HPE Quickspecs for your specific chassis before ordering.

Q: Is the P77492-B21 a new or refurbished component?

A: The P77492-B21 is sourced as a factory-new, genuine HPE component — not refurbished or pull-grade.

Q: What does a retimer do in a PCIe Gen 4 server?

A: A PCIe Gen 4 retimer re-clocks and re-drives high-speed signals between interconnect points inside the chassis. At Gen 4 speeds (16 GT/s per lane), signal integrity over longer PCB traces degrades — an active retimer restores the signal to spec before it reaches the endpoint, maintaining link stability and preventing bit errors that could reduce effective bandwidth or cause link downtime.

Q: Can the P77492-B21 be used in a different slot position on the DL380 G12?

A: The B1/3 designation is a platform-specific slot assignment. Using a retimer in an incorrect slot position is not supported. Refer to the HPE DL380 Gen12 Quickspecs and chassis riser documentation to confirm the correct component for your target slot before installation.

Q: What is the weight of the P77492-B21?

A: The P77492-B21 weighs 2.69 lb as shipped.

James Everett

The HPE P77492-B21 is one of those components that doesn't get attention until it's missing from a build — and then it stops the whole project. It's a platform-specific PCIe Gen 4 retimer for the B1/3 position on the ProLiant DL380 Gen12, and the key thing to understand is that 'specific' is doing a lot of work in that sentence. At 2.69 lb, it's clearly a sub-board assembly, not a standalone adapter card, and it's not interchangeable with retimers from other DL380 generations.

Technical Highlights:

• PCIe Gen 4 Retiming: Gen 4 runs at 16 GT/s per lane — double Gen 3. Active retimers on this platform preserve eye-opening compliance across longer internal traces where passive copper would degrade signal quality and introduce link instability.
• B1/3 Slot Specificity: The B1/3 designation maps to a defined riser/slot pair in the DL380 G12 chassis. Platform-matched sourcing means the component is validated against HPE firmware and mechanical fit for that position — generic substitutes carry integration risk.
• Factory-New Provenance: Sourced new, not refurbished. For production servers under active HPE support contracts, component provenance affects warranty coverage — pull-grade parts can complicate that conversation.

Deployment Considerations:

• Before ordering, pull the DL380 Gen12 Quickspecs and confirm the B1/3 retimer position applies to your specific riser configuration — the G12 platform has multiple riser options and not every chassis ships with the same slot mapping populated.
• This component is not field-swappable during live operation — plan the installation window accordingly for production DL380 G12 systems.

The P77492-B21 fits best in enterprise data center environments running ProLiant DL380 Gen12 servers where a PCIe Gen 4 expansion or repair requires restoring the correct retimer in the B1/3 position — particularly relevant in high-density compute or storage-expansion builds where Gen 4 link integrity directly affects throughput to NVMe or accelerator cards.