P64708-B21: HPE 96GB (1x96GB) Dual Rank x4 DDR5-5600 CAS-46-45-45 EC8 Registered Smart Memory Kit
Also listed as: P65422-001, P64247-001, M321R12B0BB0-CWM, HMCG98AGB418N · made by Samsung
The HPE P64708-B21 is a 96GB dual-rank x4 DDR5-5600 Registered SmartMemory kit leveraging monolithic 24Gb DRAM die density for HPE ProLiant Gen11 servers. By providing 96GB per slot without resorting to expensive quad-rank 3DS stacked silicon, it offers exceptional cost efficiency and thermal profiles for large-footprint virtualization and in-memory database clusters. Buyers of used modules must verify BIOS version compatibility for 24Gb non-binary density support and check error logs.
Specifications
| Part number | P64708-B21 |
|---|---|
| Brand | HPE |
| Made by | Samsung |
| Type | Memory |
| Other numbers | P65422-001, P64247-001, M321R12B0BB0-CWM, HMCG98AGB418N |
| Status | current |
| Capacity (GB) | 96 |
| Memory type | DDR5 |
| Speed | DDR5-5600 |
| Rank width | 2Rx4 |
| Dimm type | RDIMM |
| Voltage | 1.1V |
| Cas latency | 46 |
| Pin count | 288 |
| Error correction | ECC (EC8) |
| Generation fit | Gen11 / Gen12 |
About the P64708-B21
The HPE P64708-B21 introduces non-binary memory capacity to enterprise compute, delivering 96GB per registered DIMM using next-generation 24Gb monolithic DRAM die fabrication. Operating at up to 5600 MT/s in dual-rank 2Rx4 configuration, it bridges the density gap between conventional 64GB RDIMMs and costly 128GB 3DS stacked modules. It is engineered specifically for memory-intensive enterprise virtualization, SAP HANA test environments, and multi-tenant cloud platforms requiring massive memory capacity per socket.
Compatibility
Compatible with HPE ProLiant Gen11 servers running 5th Generation Intel Xeon Scalable processors (Emerald Rapids) or AMD EPYC 9004 series CPUs with firmware that supports 24Gb density DRAM. Requires UEFI System ROM release v1.50 or later on Gen11 servers to properly enumerate 96GB non-binary DIMM geometries. It is incompatible with DDR4-based Gen10 systems. While it can co-exist across separate memory channels with 64GB 2Rx4 modules, balanced populations using identical 96GB modules across all channels are mandatory for maximum memory interleaving performance.
How to identify a genuine unit
Legitimate P64708-B21 kits carry an authentic HPE security label indicating Option Part Number P64708-B21, Spare Part Number P65422-001, and module code 96GB 2Rx4 PC5-5600B-RC0-1010-XT. An authentic HPE cryptographically signed SPD allows iLO 6 to verify the unit as HPE Genuine SmartMemory. Silkscreen and package markings confirm Samsung (M321R12B0BB0-CWM) or SK Hynix 24Gb component architectures.
Buying used
When acquiring pre-owned or surplus 96GB DDR5 modules, verify that the edge connector contacts have not suffered gold plating delamination or mechanical bending. Ensure the server intended for deployment has been updated to the required Gen11 BIOS firmware before installation, as older BIOS builds fail POST when encountering 24Gb DRAM densities. Inspect iLO Event Logs during burn-in testing to confirm zero correctable ECC threshold alarms.
Reference prices (last 14 days, updated 2026-10-27)
New: USD 895 (1 sighting, Oct 2026)
Refurbished: USD 490 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | new | USD 895 | Factory sealed new retail kit | 2026-10-27 |
| globalonetechnology.com | refurbished | USD 490 | Refurbished module with full functional test pass | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Fits these models
- HPE ProLiant DL380 Gen11
- HPE ProLiant DL360 Gen11
- HPE ProLiant DL385 Gen11
- HPE ProLiant DL325 Gen11
- HPE ProLiant DL560 Gen11
- HPE ProLiant ML350 Gen11
Equivalent part numbers
- Samsung M321R12B0BB0-CWM Samsung 96GB 2Rx4 DDR5-5600 ECC RDIMM OEM module
FAQ
Why choose 96GB RDIMMs (P64708-B21) instead of 128GB 3DS RDIMMs?
96GB modules use standard monolithic 24Gb silicon dies rather than 3DS through-silicon via stacking, providing lower latency, lower power draw, significantly lower price per gigabyte, and standard thermal profiles.
Does P64708-B21 work on 4th Gen Intel Xeon Scalable processors (Sapphire Rapids)?
Support for 24Gb density 96GB modules requires specific microcode and BIOS support. With updated Gen11 system ROM, 4th Gen Xeon processors support the module at 4800 MT/s, while 5th Gen Emerald Rapids runs it at 5600 MT/s.
Buying or selling P64708-B21?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- HPE ProLiant Gen11 Memory Technology White Paper, checked 2026-10-27
- HPE PartSurfer P64708-B21 Record, checked 2026-10-27