Home › Parts › HPE part numbers

P64706-B21: HPE 32GB (1x32GB) Single Rank x4 DDR5-5600 CAS-46-45-45 EC8 Registered Smart Memory Kit

HPEMemory

Also listed as: P65420-001, P64245-001, M321R4GA3PB0-CWM, HMCG88AGB418N, MTA18ASF4G72PZ-5G6 · made by Samsung

The HPE P64706-B21 is a 32GB single-rank x4 DDR5-5600 Registered ECC SmartMemory kit designed for HPE ProLiant Gen11 servers powered by 5th Gen Intel Xeon Scalable or AMD EPYC 9004 processors. Built on 1Rx4 topology with integrated Power Management IC (PMIC) and EC8 sideband error correction, this module delivers 5600 MT/s memory bandwidth while keeping channel electrical loading to a single rank. Buyers of used kits should verify genuine HPE SPD cryptographic authentication in iLO 6 and test for uncorrectable memory errors.

Buy P64706-B21Sell yours

Specifications

Part numberP64706-B21
BrandHPE
Made bySamsung
TypeMemory
Other numbersP65420-001, P64245-001, M321R4GA3PB0-CWM, HMCG88AGB418N, MTA18ASF4G72PZ-5G6
Statuscurrent
Capacity (GB)32
Memory typeDDR5
SpeedDDR5-5600
Rank width1Rx4
Dimm typeRDIMM
Voltage1.1V
Cas latency46
Pin count288
Error correctionECC (EC8)
Generation fitGen11 / Gen12

About the P64706-B21

The HPE P64706-B21 is a high-volume workhorse module in the HPE DDR5 SmartMemory lineup, offering 32GB capacity organized in a single-rank 1Rx4 layout at 5600 MT/s. Built specifically for 5th Generation Intel Xeon Scalable processors (Emerald Rapids) and AMD EPYC 9004 series servers, it offers high-speed execution for general-purpose virtualization, mid-sized database environments, and application serving. The single-rank design minimizes capacitive loading on memory buses, enabling optimal signal timing.

Compatibility

Compatible exclusively with HPE ProLiant Gen11 and Gen12 server architectures utilizing DDR5 288-pin sockets. Systems with 5th Gen Xeon Scalable processors run this module at full 5600 MT/s in 1DPC (1 DIMM per channel) configuration; when installed with 4th Gen Xeon (Sapphire Rapids) CPUs, the server automatically clocks the bus to 4800 MT/s. Because this is a 1Rx4 module, it can be paired with dual-rank 2Rx4 modules in approved multi-rank slot configurations, but must never be mixed with x8 organized modules within the same channel.

How to identify a genuine unit

Authentic P64706-B21 modules feature an HPE SmartMemory security label showing Option Part Number P64706-B21, Spare Part Number P65420-001, and the designation 32GB 1Rx4 PC5-5600B-RC0-1010-XT. During POST, the HPE ProLiant Gen11 UEFI BIOS validates the cryptographic signature in the SPD chip; legitimate modules illuminate as 'HPE SmartMemory' in the iLO 6 system information pane. The bare PCB reveals Samsung (M321R4GA3PB0-CWM) or SK Hynix DRAM component markings.

Buying used

When inspecting used P64706-B21 memory kits, verify that the 288 contact fingers are free of gouges, scratches, and flux residue. Check the onboard PMIC component for physical discoloration, heat blistering, or missing decoupling capacitors. Run the HPE Intelligent Provisioning memory diagnostic suite or MemTest86 for several passes to guarantee that no single-bit or multi-bit ECC threshold warnings are triggered in the iLO Integrated Management Log (IML).

Reference prices (last 14 days, updated 2026-10-27)

New: USD 275 (1 sighting, Oct 2026)

Refurbished: USD 145 (1 sighting, Oct 2026)

All sightings
SellerConditionPriceNoteSeen
serversupply.comnewUSD 275New factory sealed retail kit2026-10-27
globalonetechnology.comrefurbishedUSD 145Refurbished genuine module, tested clean2026-10-27

Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.

Fits these models

Equivalent part numbers

FAQ

What is the operational difference between P64706-B21 (32GB 1Rx4) and P64707-B21 (64GB 2Rx4)?

P64706-B21 is a single-rank 32GB module exerting lighter electrical bus load, whereas P64707-B21 is a dual-rank 64GB module offering twice the density per slot for high-memory virtualization hosts.

Can I install P64706-B21 into an HPE ProLiant DL380 Gen10 Plus server?

No, DL380 Gen10 Plus servers use DDR4 memory modules and DDR4 DIMM sockets. P64706-B21 is a DDR5 module with a different notch position and pinout compatible only with Gen11 and newer platforms.

Buying or selling P64706-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.

Buy P64706-B21Sell yours

Sources