726720-B21: HPE 32GB (1x32GB) Dual Rank x4 DDR4-2133 CAS-15-15-15 Registered Smart Memory Kit
Also listed as: 774173-001, 752370-081, M393A4G40AB0-CPB, HMA84GR7MFR4N-TF · made by Samsung
The HPE 726720-B21 is a high-density 32GB dual-rank DDR4-2133 ECC registered SmartMemory DIMM kit engineered for memory-dense enterprise Gen9 compute clusters. Offering 32GB per slot without load-reduction buffers, it allows high-capacity virtualization and database deployments up to 768GB per dual-socket node with low latency.
Specifications
| Part number | 726720-B21 |
|---|---|
| Brand | HPE |
| Made by | Samsung |
| Type | Memory |
| Other numbers | 774173-001, 752370-081, M393A4G40AB0-CPB, HMA84GR7MFR4N-TF |
| Status | end of sale |
| Capacity | 32GB |
| Type | DDR4-2133 Registered DIMM (RDIMM) |
| Speed | 2133 MT/s (PC4-17000) |
| Voltage | 1.2V |
| Rank | Dual Rank (2Rx4) |
| Cas latency | 15-15-15 |
| Generation fit | ProLiant Gen9 servers with Intel Xeon E5-2600 v3/v4 processors |
About the 726720-B21
726720-B21 provides 32GB of dual-rank registered ECC DDR4-2133 memory for high-density virtualization and database hosting on HPE ProLiant Gen9 servers. Built with dense 8Gb monolithic DRAM ICs, it achieves large RAM footprints without the electrical and latency overhead of load-reduced DIMM designs.
Compatibility
Fully compatible with HPE ProLiant DL380 Gen9, DL360 Gen9, DL160 Gen9, DL180 Gen9, DL120 Gen9, DL60 Gen9, DL80 Gen9, DL560 Gen9, DL580 Gen9, ML350 Gen9, ML110 Gen9, ML150 Gen9, Apollo 4200 Gen9, and Synergy 480 Gen9 servers equipped with Intel Xeon E5-2600 v3/v4 processors.
How to identify a genuine unit
Standard 288-pin DDR4 registered DIMM with Samsung or SK hynix DRAM packages on both sides. Central white product label states option part number 726720-B21, spare part number 774173-001, and assembly part number 752370-081 alongside genuine holographic HPE seal.
Buying used
Inspect the 288 gold edge connector contact pins for physical damage, scratches, or uneven insertion wear. Verify module authenticates under HPE iLO 4 with authentic SmartMemory status, and run memory burn-in tests to confirm absence of correctable or uncorrectable ECC errors under load.
Reference prices (last 12 months, updated 2026-10-27)
Used: USD 32 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| ebay.com | used | USD 32 | Tested working HPE 32GB 2Rx4 DDR4-2133 RDIMM with warranty | 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 Gen9
- HPE ProLiant DL360 Gen9
- HPE ProLiant DL160 Gen9
- HPE ProLiant DL180 Gen9
- HPE ProLiant DL120 Gen9
- HPE ProLiant DL60 Gen9
- HPE ProLiant DL80 Gen9
- HPE ProLiant DL560 Gen9
- HPE ProLiant DL580 Gen9
- HPE ProLiant ML350 Gen9
- HPE ProLiant ML110 Gen9
- HPE ProLiant ML150 Gen9
- HPE Apollo 4200 Gen9
- HPE SimpliVity 380 Gen9
- HPE Synergy 480 Gen9 Compute Module
Check compatibility with HPE
Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that HPE has tested with the HPE 726720-B21.
- Compatibility HPE SPOCK (storage, SAN and host compatibility)
- Part lookup HPE PartSurfer (spare and option part numbers)
- Support HPE Support Center
Equivalent part numbers
- Samsung M393A4G40AB0-CPB Samsung 32GB 2Rx4 DDR4-2133 ECC RDIMM
- Dell A7946560 Dell 32GB 2Rx4 DDR4-2133 RDIMM
FAQ
What is the maximum memory capacity achievable in DL380 Gen9 with 726720-B21?
Using 24 slots populated with 32GB RDIMMs, a dual-socket DL380 Gen9 achieves 768GB of system RAM running at 2133 MT/s.
Can 726720-B21 be mixed with 16GB RDIMMs?
Yes, mixing 16GB and 32GB RDIMMs is supported across different memory channels according to standard HPE Gen9 memory population rules.
Buying or selling 726720-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 DL380 Gen9 Server QuickSpecs - Core Options, checked 2026-10-27