HPE 64GB Dual Rank 2Rx4 PC5-6400B-R Registered Smart Memory
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Part number cross-reference
- Part number
- P69721-1A1
Overview
P69721-1A1 is the HPE assembly part number for 64GB Dual Rank 2Rx4 PC5-6400B-R Registered Smart Memory. This is the number you are most likely to see printed on the module label or returned by an HPE PartSurfer lookup, rather than on a purchase order. The module itself is a 64 GB DDR5 RDIMM in the 288-pin form factor, running at 6400 MHz (PC5-6400B-R) with CL46 (46-39-39) timings, built as a dual rank, registered module with x4 chip organization. If the label in front of you reads P69721-1A1, you are holding this module.
HPE Option Part #: P64986-B21
HPE Spare Part #: P65248-001
HPE Assembly Part #: P69721-1A1
PRODUCT SPECIFICATIONS FOR P69721-1A1:
- Capacity: 64 GB
- Width: 3.5 in
- Depth: 7.5 in
- Height: 0.8 in
- Weight: 1.41 oz
- Type: DRAM memory module
- Technology: DDR5 SDRAM
- Form Factor: RDIMM 288-pin
- Speed: 6400 MHz (PC5-6400B-R)
- Latency Timings: CL46 (46-39-39)
- Features: Dual Rank, registered
- Chips Organization: X4
COMPATIBLE WITH:
PROLIANT DL SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT P69721-1A1
What is the difference between P69721-1A1, P64986-B21 and P65248-001?
They identify the same physical memory module under three different HPE numbering schemes. This page, P69721-1A1, is the assembly number, the identifier typically found on the module label and in PartSurfer output. P64986-B21 is the option number used for ordering the module as a sellable product. P65248-001 is the spare number used for service replacement. The 64 GB DDR5 RDIMM itself is identical in every case.
How do I confirm the module in my hand matches this listing?
Check the label for the assembly number P69721-1A1 and the memory description. The specification should read 64 GB, DDR5 SDRAM, 288-pin RDIMM, PC5-6400B-R at 6400 MHz, with CL46 (46-39-39) latency timings. The module is dual rank (2Rx4) and registered, using x4 chip organization. If those attributes line up, it is the same part described here.
Which servers does this module support?
This 64 GB PC5-6400B-R RDIMM is listed as compatible with the HPE ProLiant DL325 Gen11, DL345 Gen11, DL365 Gen11 and DL385 Gen11, in each case with 5th Gen processors installed. Because DDR5 memory support is tied to the installed CPU generation, confirm the processor in the target server before installing.
What do the 2Rx4 and PC5-6400B-R markings mean?
2Rx4 indicates the module is dual rank with x4 DRAM chip organization. PC5-6400B-R identifies it as a DDR5 module rated at 6400 MHz in registered (RDIMM) form. The registered design places a register between the memory controller and the DRAM chips, which is standard for server memory. The rated latency for this module is CL46 (46-39-39).
Last Updated: 2026-10-22
Other sizes in this family
| Part number | Capacity | Type | Rank | Price | Availability |
|---|
Working out how many you need? Each server's memory page counts the modules for the capacity you want: see Compatible servers.
Specifications
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Part numbers
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Questions about P69721-1A1
Warranty and returns
5-year replacement warranty
Covered against hardware failure for 5 years from the date of purchase. While HPE's own warranty runs, HPE replaces a failed part through the HPE Enterprise Support Center. After that, send it back to us for a working replacement; you ship it to us and we pay Ground or Economy shipping on the replacement.
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P69721-1A1 HPE 64GB Dual Rank 2Rx4 PC5-6400B-R Registered Smart Memory
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