HPE 16GB (1x16GB) Dual Rank x8 DDR4-2666 CAS-19-19-19 Registered Smart Memory Kit
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Part number cross-reference
- Part number
- 840756-191
Overview
This item, 840756-191, is the HPE assembly number for the product described as 16GB (1x16GB) Dual Rank x8 DDR4-2666 CAS-19-19-19 Registered Smart Memory Kit. Further details below.
This 16GB HPE DDR4-2666 registered DIMM is designed to enhance the performance and stability of your Gen10 server. Operating at a speed of 2666 MHz with CAS Latency of 19-19-19, this module ensures quick data access and reduces bottlenecks in demanding applications.
Featuring dual-rank architecture and ECC data integrity, this memory kit provides reliable performance for critical workloads. This item is compatible with Gen10 servers; the list of compatible machines includes but may not be limited to the models provided. Designed for easy installation and optimal compatibility, this memory upgrade is an excellent choice for improving your server's responsiveness and overall efficiency.
HPE Option Part #: 838089-B21
HPE Spare Part #: 870840-001
HPE Assembly Part #: 840756-191
PRODUCT SPECIFICATIONS FOR 840756-191:
- Capacity: 16 GB
- Upgrade Type: System specific
- OEM Manufacturer Equivalent Part Number: HP 838089-B21, HP 870840-001
- Type: DRAM memory module
- Technology: DDR4 SDRAM
- Form Factor: DIMM 288-pin
- Speed: 2666 MHz (PC4-21300)
- Latency Timings: CL19 (19-19-19)
- Data Integrity Check: ECC
- Features: Dual Rank, registered
- Module Configuration: 2048 x 72
- Chips Organization: X8
- Voltage: 1.2 V
COMPATIBLE WITH:
OTHER HPE MACHINES
** This list may not be complete. Contact us via Live Chat if you have any questions about compatibility.
HPE PARTSURFER INFO FOR 840756-191 (838089-B21)
| Spare PN | Description | |
|---|---|---|
 | 870840-001 | 16GB PC4-2666V-R - registered synchronous dynamic random access memory (SDRAM), dual data rate (DDR4) mode, dual in-line memory module (DIMM) organized as 2Gx72 |
Last Updated: 2026-05-21
Other sizes in this family
| Part number | Capacity | Type | Rank | Price | Availability |
|---|
Working out how many you need? Each server's memory page counts the modules for the capacity you want: see Compatible servers.
Specifications
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Part numbers
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Questions about 840756-191
Warranty and returns
5-year replacement warranty
Covered against hardware failure for 5 years from the date of purchase. While HPE's own warranty runs, HPE replaces a failed part through the HPE Enterprise Support Center. After that, send it back to us for a working replacement; you ship it to us and we pay Ground or Economy shipping on the replacement.
Ordered the wrong part?
It is the customer's responsibility to verify compatibility before ordering. A part ordered by mistake can be returned for a refund, less a 25% restocking fee, within 5 business days of receipt. Freight is not refunded, and factory-sealed items can only be returned unopened. Check Compatible servers before you order.
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840756-191 HPE 16GB (1x16GB) Dual Rank x8 DDR4-2666 CAS-19-19-19 Registered Smart Memory Kit
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