HPE DL320/DL380 G11 PCIE G5 Retimer Card - P48833-B21

HPE P48833-B21 PCIe Gen 5 Retimer Card for ProLiant DL320 and DL380 Gen11

Overview

The HPE P48833-B21 is a PCIe Gen 5 retimer card designed to support signal integrity on high-speed PCIe interconnects in HPE ProLiant DL320 Gen11 and DL380 Gen11 server platforms. Retimer cards like the P48833-B21 (often searched as P48833 B21) exist to solve a specific signal-integrity problem: at PCIe Gen 5 speeds — 32 GT/s per lane — trace lengths and connector losses that were acceptable in Gen 4 systems start causing link instability, training failures, or reduced negotiated link speeds. A retimer re-clocks and reshapes the signal mid-path, allowing the platform to reliably operate PCIe Gen 5 lanes at rated performance.

This card is a platform-specific component sourced through HPE's supply chain across multiple manufacturing regions, reflecting standard enterprise-component multi-site production. If you are expanding or servicing a DL320 Gen11 or DL380 Gen11 and the platform calls out this option kit, the P48833-B21 is the correct field-installable part.

Key Features

• PCIe Gen 5 Signal Retiming: Restores clean, re-clocked signals on 32 GT/s PCIe lanes — prevents link negotiation fallback to lower speeds that would bottleneck NVMe Gen 5 SSDs or high-bandwidth accelerators installed downstream.
• Platform-Specific Fit: Designed for HPE ProLiant DL320 Gen11 and DL380 Gen11 — slot placement, power rail, and mechanical clearances are validated against these chassis. Using an incorrect or third-party retimer risks link instability that is difficult to diagnose.
• Lightweight Add-In Card (0.71 lb): At 0.71 lb, this card adds negligible weight to a rack-mounted chassis — no rebalancing or additional rail load calculations needed in typical 1U or 2U deployments.
• Factory-New Genuine Component: Sourced as a new HPE option kit — not a pulled or refurbished part — ensuring the retimer IC and PCB meet HPE's manufacturing tolerances for the Gen11 platform.

Integration and Compatibility

The P48833-B21 is validated for use in the HPE ProLiant HPE server Gen11 lineup, specifically the DL320 Gen11 and DL380 Gen11. If you are building out a high-speed storage or compute expansion on one of these platforms and the HPE option matrix lists this retimer as required for a given slot or drive cage configuration, install it before populating downstream PCIe Gen 5 devices. Check HPE's platform QuickSpecs for the DL320 Gen11 or DL380 Gen11 to confirm whether your specific configuration requires this card — not all configurations mandate it, but those running Gen 5 NVMe or accelerator cards in certain slot positions do.

For organizations building out data center server infrastructure with Gen11 ProLiant platforms, confirm the full HPE option kit BOM against your chassis serial and firmware version before ordering to avoid compatibility mismatches. This card is not compatible with Gen10 or Gen10 Plus DL platforms — the retimer architecture and mechanical form factor are Gen11-specific.

Frequently Asked Questions

Q: What servers is the HPE P48833-B21 compatible with?

A: The P48833-B21 is designed for the HPE ProLiant DL320 Gen11 and DL380 Gen11 server platforms. It is not validated for Gen10 or earlier ProLiant generations.

Q: What does a PCIe retimer card do and why does my server need one?

A: A PCIe Gen 5 retimer re-clocks and reshapes high-speed PCIe signals (32 GT/s per lane) that degrade over trace lengths and connectors inside the chassis. Without a retimer in configurations where signal path losses are high, PCIe links may train at a lower generation speed or fail to establish a stable link — causing reduced NVMe throughput or accelerator performance. HPE specifies the P48833-B21 where this card is needed to maintain rated Gen 5 link performance.

Q: Is the P48833-B21 required for all DL320 Gen11 and DL380 Gen11 configurations?

A: No — not all configurations require this card. HPE's platform QuickSpecs define which slot or drive cage configurations mandate a retimer. Consult the QuickSpecs for your specific DL320 Gen11 or DL380 Gen11 build before ordering.

Q: Can the P48833-B21 be used in third-party or non-HPE servers?

A: No. This is an HPE platform-specific option kit validated for HPE ProLiant Gen11 chassis dimensions, power rails, and firmware. It is not designed or validated for third-party server platforms.

Q: What is the weight of the P48833-B21?

A: The P48833-B21 weighs 0.71 lb, making it a lightweight add-in card with no meaningful impact on chassis weight or rack load calculations.

James Everett

The P48833-B21 is the kind of part that disappears into a BOM and causes real problems when it is missing. PCIe Gen 5 at 32 GT/s is genuinely unforgiving on signal integrity — the DL320 Gen11 and DL380 Gen11 platforms require this retimer in specific configurations to keep downstream Gen 5 devices training at full speed rather than falling back to Gen 4 or lower. If you are populating Gen 5 NVMe drives or accelerators in the affected slots and skip this card, you will see reduced throughput or unstable links, and the fault is not always obvious in firmware logs without knowing to look for retimer-related link training events.

Technical Highlights:

• PCIe Gen 5 retiming function: Operates at 32 GT/s per lane — the retimer IC re-clocks the signal to eliminate accumulated jitter and attenuation before it reaches the endpoint device, maintaining the full Gen 5 link speed rather than a negotiated fallback.
• Platform-validated fit: Mechanically and electrically specific to the DL320 Gen11 and DL380 Gen11 — HPE's option kit designation means firmware, slot timing, and power sequencing are all accounted for in the platform design.
• 0.71 lb add-in card: Lightweight enough that no rack or chassis weight recalculation is needed — installs without logistical overhead in a field-service context.

Deployment Considerations:

• Verify the HPE QuickSpecs for your specific DL320 Gen11 or DL380 Gen11 configuration before ordering — this card is required for certain slot and drive cage combinations, not universally for all Gen11 builds. Ordering it for a configuration that does not require it wastes budget; missing it in a configuration that does require it causes link-training failures that are time-consuming to diagnose.
• This card is not a cross-platform part — do not attempt to use it in Gen10, Gen10 Plus, or any non-HPE chassis. The mechanical form factor and power rail expectations are specific to the Gen11 platform design.

The P48833-B21 is the correct option kit for data center teams expanding or servicing DL320 Gen11 or DL380 Gen11 platforms with PCIe Gen 5 storage or compute devices in configurations where HPE's QuickSpecs call it out — confirm your build's option matrix before the chassis ships to avoid a field retrofit.