HPE 64GB (1x64GB) Dual Rank x4 DDR5-6400 CAS-46-45-45 EC8 Registered Smart Memory Kit
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Part number cross-reference
- Part number
- P69728-B21
Overview
This item, P69728-B21, is the HPE option part number for the product described as 64GB (1x64GB) Dual Rank x4 DDR5-6400 CAS-46-45-45 EC8 Registered Smart Memory Kit. Further details below.
Expand your HPE Gen12 server with the P69728-B21, a genuine HPE SmartMemory 64GB (1x64GB) DDR5-6400 registered DIMM. Running at 6400 MT/s (PC5-51200) on a 288-pin Dual Rank x4 (2Rx4) RDIMM at just 1.1V, it delivers the bandwidth headroom demanding virtualization, database, and analytics workloads need, while EC8 registered ECC guards against single-bit errors for dependable, around-the-clock uptime.
As HPE SmartMemory, P69728-B21 is authenticated by the server to report full performance and reliability data, so you avoid the compatibility guesswork of third-party modules. It is supported in a wide range of Gen12 platforms including the DL320, DL340, DL340e, DL360, DL380, DL380a, DL580, DL110, ML350, EL140, Synergy 480 Gen12, and the Alletra Storage Server 4210 - making it an easy, scalable upgrade path across your fleet.
HPE Option Part #: P69728-B21
HPE Spare Part #: P71256-001
HPE Assembly Part #: P69721-0A1
PRODUCT SPECIFICATIONS FOR P69728-B21:
- Capacity: 64 GB (1 x 64 GB module)
- Memory Type: DDR5 SDRAM
- Speed: 6400 MT/s (PC5-51200)
- Form Factor: 288-pin DIMM (RDIMM - Registered DIMM)
- Rank & Organization: Dual Rank (2Rx4), x4 chip organization
- Error Correction: ECC (EC8 Registered)
- Voltage: 1.1V
- CAS Latency: CL52 (or CL46 depending on specific sub-vendor/profile specs)
- Brand: HPE SmartMemory
COMPATIBLE WITH:
PROLIANT DL SERIES
PROLIANT SYNERGY SERIES
PROLIANT ML SERIES
PROLIANT EL SERIES
PROLIANT ALLETRA SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS FOR P69728-B21:
- How much memory does P69728-B21 include?
P69728-B21 is a single-module kit: one 64GB DDR5 registered DIMM (1x64GB). Order multiple kits to populate additional channels or slots as your workload grows. - Which servers support P69728-B21?
P69728-B21 is supported in HPE Gen12 platforms including DL320, DL340, DL340e, DL360, DL380, DL380a, DL580, DL110, ML350, and EL140 Gen12, Synergy 480 Gen12, and the Alletra Storage Server 4210. - What are the key technical specs of P69728-B21?
It is a 64GB DDR5-6400 (PC5-51200) 288-pin RDIMM, dual rank x4 (2Rx4) organization, EC8 registered ECC, 1.1V, HPE SmartMemory branded. CAS latency is CL46/CL52 depending on the profile.
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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Questions about P69728-B21
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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P69728-B21 HPE 64GB (1x64GB) Dual Rank x4 DDR5-6400 CAS-46-45-45 EC8 Registered Smart Memory Kit
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