HP M0S31A 128GB Kit (4x32GB) DDR4-2133MHz RDIMM 2Rx4 CL15 Memory

Key specifications

The figures below come from this listing's own record. They are the ones that decide whether a part drops into an existing system.

• Memory Capacity: 128GB (4 x 32GB). Capacity of this module, not of the system.
• RAM Genre: RDIMM. The module type, such as registered, load reduced or unbuffered; types cannot be mixed in one system.
• Memory Technology: DDR4. The memory generation the module belongs to.
• RAM Speed: 2133 MHz. Rated speed; a bank runs at the speed of its slowest module.
• RAM Standard: DDR4-2133/PC4-17000. The JEDEC speed grade printed on the module.
• Quantity of Pins: 288-pin. Pin count, which follows the generation and form factor.
• Rank: Dual Rank x4. Rank count, which affects how heavily a memory channel can be populated.
• Column Access Strobe (CAS): CL15. CAS latency, in clock cycles.
• Product Voltage: 1.2 V. The operating or input voltage recorded for this part.

Confirming fit

Memory Clearance does not publish a verified compatibility list for M0S31A. Whether a part of this type is supported is defined by the system or switch vendor's own compatibility matrix, not by the part on its own.

The dependable check is the part number. Read the installed part number from the system's management interface and compare it with the number on this listing. If you send your server model with a quote request, it is checked against this part before you order.

Other HPE Server Memory listings

Other parts in the same brand and category. These are not substitutes for this part number; check the specification before ordering.

• HPE R4C17A 128GB Kit (8x16GB) DDR4-2933MHz RDIMM 1Rx4 CL21 Memory
• HPE HMA42GR7AFR4N-UH/HPE 16GB DDR4-2400MHz PC4-19200 ECC Registered CL17 288-Pin RDIMM 1.2V...
• HPE P14398-B21 16GB DDR4-3200MHz RDIMM 2Rx4 CL22 Memory
• HPE 825109-091 16GB DDR4-2666MHz NVDIMM 1Rx4 CL19 Memory
• HPE MTA36ASF2G72LZ-2G1A1/HPE 16GB DDR4-2133MHz PC4-17000 ECC Registered CL15 288-Pin LRDIMM...
• HP 887452-181 16GB DDR4-2400MHz RDIMM 1Rx4 CL17 Memory
• HP 851353-S21 8GB DDR4-2400MHz RDIMM 1Rx8 CL17 Memory
• HPE MTA9ASF1G72PZ-2G6D1/HPE 8GB DDR4-2666MHz PC4-21300 ECC Registered CL19 288-Pin RDIMM 1.2V...
• HP 839985-B21 32GB DDR4-2133MHz LRDIMM 4Rx4 CL15 Memory
• HP R1Q91A 192GB Kit (6x32GB) DDR4-2666MHz RDIMM 2Rx4 CL19 Memory

Common questions

Is M0S31A in stock?

Stock moves, so the quantity shown on this listing is the current figure. For a larger quantity, send the part number and how many you need and the answer comes back against that exact number. Quotes are answered weekdays 8:00 am to 5:00 pm PST.

Can I mix this module with the ones already installed?

Registered, load reduced and unbuffered modules cannot be mixed in one system, and a bank runs at the speed of its slowest module. Match the type and rank already installed, or replace the full bank.

How do I check what my server takes?

Read an installed part number from iDRAC or iLO and compare it with this listing, or check the platform's memory population table before ordering.

What do I send to get a price on M0S31A?

The part number, the quantity, the condition you will accept and the server model it goes into. That is enough to answer in one pass.

Guides

• Memory population rules
• Reading memory and drive specs
• Finding the right OEM part number
• Buying in volume