815098-B21: HPE 16GB (1x16GB) Single Rank x4 DDR4-2666 CAS-19-19-19 Registered Smart Memory Kit
Also listed as: 840757-091, 815098-001, 850880-001, M393A2K40BB2-CTD, HMA82GR7AFR8N-VK · made by Samsung
The HPE 815098-B21 is a 16GB single-rank x4 DDR4-2666 Registered ECC SmartMemory kit designed for 1st Generation Intel Xeon Scalable (Skylake-SP) processors across HPE ProLiant Gen10 servers. Operating at 1.2V with CAS latency 19, this module delivers robust reliability with HPE digitally signed SPD firmware. In the secondary market, this high-volume module is popular for budget server upgrades; buyers should verify intact SPD EEPROMs and inspect gold contact fingers.
Specifications
| Part number | 815098-B21 |
|---|---|
| Brand | HPE |
| Made by | Samsung |
| Type | Memory |
| Other numbers | 840757-091, 815098-001, 850880-001, M393A2K40BB2-CTD, HMA82GR7AFR8N-VK |
| Status | end of sale |
| Capacity (GB) | 16 |
| Memory type | DDR4 |
| Speed | DDR4-2666 |
| Rank width | 1Rx4 |
| Dimm type | RDIMM |
| Voltage | 1.2V |
| Cas latency | 19 |
| Pin count | 288 |
| Error correction | ECC |
| Generation fit | Gen10 |
About the 815098-B21
The HPE 815098-B21 was the cornerstone 16GB registered memory option introduced at the initial launch of HPE ProLiant Gen10 servers. Featuring a single-rank 1Rx4 layout operating at 2666 MT/s, it was optimized for 1st Gen Intel Xeon Scalable processors (Xeon Bronze, Silver, Gold, and Platinum 8100/6100/5100/4100 series). It provided the baseline memory capacity for high-density compute nodes, virtualization clusters, and enterprise application deployments.
Compatibility
Compatible with HPE ProLiant Gen10 servers including DL380 Gen10, DL360 Gen10, DL560 Gen10, DL580 Gen10, and ML350 Gen10 equipped with 1st Gen Xeon Scalable CPUs. When installed alongside 2nd Gen Xeon Scalable (Cascade Lake) processors, this module functions correctly but caps memory bus speeds at 2666 MT/s instead of the 2933 MT/s speed supported by 2nd Gen CPUs. It is physically incompatible with DDR3 systems (Gen8 and earlier) or DDR5 platforms (Gen11). It can be paired with 2Rx4 DDR4-2666 modules following standard slot-population rules.
How to identify a genuine unit
Legitimate 815098-B21 memory sticks carry the standard HPE SmartMemory label with Option Part Number 815098-B21, Spare Part Number 840757-091, and assembly string 16GB 1Rx4 PC4-2666V-R. In the HPE iLO 5 interface, genuine modules register under System Information -> Memory with valid HPE SmartMemory certification badges. The DRAM chips bear OEM branding from Samsung (M393A2K40BB2-CTD), SK Hynix (HMA82GR7AFR8N-VK), or Micron.
Buying used
As one of the most widely traded used DDR4 server modules, buyers should inspect the module edges for cracked or missing surface-mount capacitors resulting from improper insertion. Check the 288 contact fingers for uneven wear or thermal scorching. Install the module and run an HPE Intelligent Provisioning memory test to confirm that no single-bit ECC error corrections have been logged, and ensure that the module does not display a 'Non-Genuine Memory' warning in iLO 5.
Reference prices (last 14 days, updated 2026-10-27)
Refurbished: USD 28 (1 sighting, Oct 2026)
Used: USD 22 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| serversupply.com | refurbished | USD 28 | Tested refurbished module | 2026-10-27 |
| ebay.com | used | USD 22 | Clean working pull, 30-day 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 Gen10
- HPE ProLiant DL360 Gen10
- HPE ProLiant DL560 Gen10
- HPE ProLiant DL580 Gen10
- HPE ProLiant ML350 Gen10
Equivalent part numbers
- Samsung M393A2K40BB2-CTD Samsung 16GB 1Rx4 DDR4-2666 ECC RDIMM OEM module
FAQ
Can 815098-B21 run alongside DDR4-2933 or DDR4-3200 modules in a DL380 Gen10?
Yes, but the memory bus will down-clock to match the slowest installed module (2666 MT/s). For optimal performance and balanced interleaving, populate all channels with matched speed modules.
What is the difference between 815098-B21 and 815097-B21?
815098-B21 is 16GB single-rank (1Rx4), whereas 815097-B21 is an 8GB single-rank (1Rx8) DDR4-2666 module.
Buying or selling 815098-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 Gen10 QuickSpecs Options, checked 2026-10-27
- HPE PartSurfer 815098-B21 Record, checked 2026-10-27