HPE 64GB Dual Rank 2Rx4 PC5-6400B-R Registered Smart Memory
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Part number cross-reference
- Part number
- P65248-001
Overview
P65248-001 is the HPE spare part number for 64GB Dual Rank 2Rx4 PC5-6400B-R Registered Smart Memory. This is the number printed on the module label and reported in HPE service documentation and iLO event logs when a DIMM fails, so it is the number to match when pulling a replacement. The module is a 288-pin DDR5 RDIMM running at 6400 MHz with CL46 (46-39-39) timings, dual rank, registered, x4 chip organization. It is supported in DL325 Gen11, DL345 Gen11, DL365 Gen11 and DL385 Gen11 servers with 5th Gen CPUs.
HPE Option Part #: P64986-B21
HPE Spare Part #: P65248-001
HPE Assembly Part #: P69721-1A1
PRODUCT SPECIFICATIONS FOR P65248-001:
- 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 P65248-001
What is the difference between P65248-001 and P64986-B21?
They are the same physical memory module under different HPE numbering schemes. P65248-001, the number on this page, is the spare part number, which is what appears on the module label and in service documentation for replacement purposes. P64986-B21 is the option part number, the orderable kit number used when memory is configured or purchased for a server. This family also includes one assembly revision, shown in the cross-reference block on the page.
What is an assembly part number?
An assembly part number identifies a specific build or manufacturing revision of the module as HPE assembled it. It maps to the same physical DDR5 RDIMM described here and carries the same electrical specification: 64 GB, dual rank 2Rx4, PC5-6400B-R, 6400 MHz, CL46. If your documentation or label shows an assembly number instead of P65248-001, check the cross-reference block on this page to confirm it belongs to this family.
Will this module fit my server?
This DIMM is a 288-pin DDR5 RDIMM and is listed as compatible with the HPE DL325 Gen11, DL345 Gen11, DL365 Gen11 and DL385 Gen11, each with 5th Gen CPUs. Compatibility outside those platforms is not covered by the specifications for this part. Before installing, confirm your server model and CPU generation match one of those combinations, and follow HPE's documented DIMM population rules for your configuration.
What are the exact specifications of this module?
Capacity is 64 GB of DDR5 SDRAM in an RDIMM 288-pin form factor. It is rated PC5-6400B-R at 6400 MHz with latency timings of CL46 (46-39-39). The module is dual rank (2Rx4) and registered, with x4 chip organization. Physical dimensions are 7.5 in deep by 3.5 in wide by 0.8 in high, and the module weighs 1.41 oz.
Do I need to match rank and speed when replacing a failed DIMM?
Yes. This part is dual rank 2Rx4 registered DDR5 rated at 6400 MHz with CL46 timings. Mixing modules of differing rank, organization or rated speed within a server can cause the system to downclock or refuse a configuration under HPE's population rules. Replacing a failed DIMM with a module matching this specification keeps the channel consistent with the rest of the installed memory.
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
Compatible servers
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Part numbers
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Questions about P65248-001
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.
Ordered the wrong part?
It is the customer's responsibility to verify compatibility before ordering. A part ordered by mistake can be returned for a refund, less a 25% restocking fee, within 5 business days of receipt. Freight is not refunded, and factory-sealed items can only be returned unopened. Check Compatible servers before you order.
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P65248-001 HPE 64GB Dual Rank 2Rx4 PC5-6400B-R Registered Smart Memory
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