815098-B21 is the HPE option part number for 16GB (1x16GB) Single Rank x4 DDR4-2666 CAS-19-19-19 Registered Smart Memory Kit. It is a 288-pin DDR4 SDRAM registered DIMM rated at 2666 MHz, compliant with PC4-21300, running at 1.2 V with CAS latency CL19 and 19-19-19 timings. The module is single rank, x4 organized, configured 2048 x 72, and carries ECC for data integrity. As an HPE SmartMemory part, it is qualified for Gen10 platforms with first-generation processors, including the DL360, DL380, DL560, DL580, ML110, ML350, BL460c, XL170r and XL190r. Order it by option number when populating a new configuration or adding capacity to existing DIMM slots.
HPE Option Part #: 815098-B21
HPE Spare Part #: 850880-001
HPE Assembly Part #: 840757-091
PRODUCT SPECIFICATIONS FOR 815098-B21:
- Brand: HPE
- Product Line: HPE, HPE SmartMemory
- Type: DRAM
- Product Type: Memory module
- Form Factor: DIMM 288-pin
- Technology: DDR4 SDRAM
- Storage Capacity: 16 GB
- Registered or Buffered: Registered
- Data Integrity Check: ECC
- Module Configuration: 2048 x 72
- Chips Organization: X4
- Memory Speed: 2666 megahertz
- Memory Specification Compliance: PC4-21300
- Supply Voltage: 1.2 volt
- CAS Latency: CL19
- Latency Timings: 19-19-19
- RAM Features: Single Rank
RESOURCES FOR 815098-B21
Quickspecs for 815098-B21COMPATIBLE WITH:
PROLIANT BL SERIES
PROLIANT DL SERIES
PROLIANT ML SERIES
PROLIANT XL SERIES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
FREQUENTLY ASKED QUESTIONS ABOUT 815098-B21
What is the difference between 815098-B21 and 850880-001?
They are the same physical memory module identified by different HPE numbering schemes. This page, 815098-B21, is the option part number — the orderable number used when configuring or adding memory to a server. 850880-001 is the spare part number, used for service replacement of an installed module. This family also includes one assembly revision, shown in the cross-reference block on this page. An assembly part number identifies the manufactured build of the module itself.
Which servers accept this module?
It is qualified for HPE Gen10 servers with first-generation processors: BL460c Gen10, DL360 Gen10, DL380 Gen10, DL560 Gen10, DL580 Gen10, ML110 Gen10, ML350 Gen10, XL170r Gen10 and XL190r Gen10. Confirm the processor generation in the target system before ordering, since the qualification here applies to first-generation CPU configurations rather than later Gen10 refreshes.
What are the electrical and timing specifications?
The module runs at 2666 MHz and meets PC4-21300, with a supply voltage of 1.2 V. CAS latency is CL19 with latency timings of 19-19-19. It is a registered DIMM with ECC data integrity checking, single rank, x4 chip organization, and a module configuration of 2048 x 72. Physically it is a 288-pin DIMM using DDR4 SDRAM.
What does single rank x4 mean for configuration planning?
Single rank means the module presents one rank of DRAM to the memory controller, and x4 describes the width of the individual DRAM devices. Rank count affects how many DIMMs a channel can support at a given speed, so review the population rules for your specific Gen10 platform when mixing this module with other ranks or capacities across channels.
Is this a genuine HPE part?
Yes. It is an HPE SmartMemory module, part of the HPE product line, supplied under HPE option number 815098-B21. HPE SmartMemory modules are validated and identified by the server firmware on qualified HPE platforms, which is why registered ECC memory for these systems is ordered by HPE part number rather than by generic DDR4-2666 specification alone.
HPE PARTSURFER INFO FOR 815098-B21
| Spare PN | Description | |
|---|---|---|
 | 850880-001 | 16GB PC4-2666V-R, registered synchronous dynamic random access memory (SDRAM) 2Gx4, operated in a dual data rate (DDR4) mode, packaged in a dual in-line memory module organized as 2Gx72 ; |
Last Updated: 2026-09-17
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- Memory Capacity
- 16GB
- Memory Rank
- Single Rank
- Memory Speed
- 2666 MHz
- Memory Type
- DDR4
5 Reviews
This product is warrantied against hardware failure for a period of 5 Years from the date of purchase. Before making a purchase, please take a moment to review our return policy below.
Returns
It is the customer's responsibility to verify compatibility with their machine(s) before placing an order. If an item is ordered by mistake, it can be returned for refund, minus a 25% restocking fee, within 5 business days of receipt. The cost of freight is not refundable.
Please be aware that factory-sealed equipment can only be returned if it remains unopened.
Defective Products
If you have received a defective part and your machine is still within the HPE warranty period, please initiate a warranty exchange by visiting the HPE Enterprise Support Center. Be sure to have the serial numbers of the defective drive and your server/storage array handy.
In case your hardware becomes defective during the Global One warranty period, but the HPE warranty has expired, you can return the product to us for a working replacement. You are responsible for the shipment of returned merchandise. However, we will cover the expense of Ground /Economy shipment for the replacement item(s).
Requesting an RMA
To initiate a return or warranty claim, please complete and submit the RMA Request Form.
