HPE 815100-S21 32GB DDR4-2666MHZ Memory

HPE 815100-S21 32GB DDR4-2666 Registered Smart Memory for ProLiant Gen10

HPE 815100-S21 is listed as a 32GB DDR4-2666 memory module for HPE ProLiant Gen10 servers. It belongs to the HPE 815100 family of 32GB dual rank x4 registered DIMMs, rated PC4-2666V-R, which run at DDR4-2666 (PC4-21300) with CAS latency 19, ECC and 1.2V.

A 32GB dual rank RDIMM is the most popular memory size for Gen10 rack servers. It gives a good balance of capacity and price for virtualisation, databases and general application hosting on first generation Xeon Scalable processors.

New and Refurbished stock of the 815100-S21 is sold by Euroland IT Store, subject to availability.

HPE 815100-S21 Technical Specifications

What Is The HPE 815100-S21?

The main option kit in this family is 815100-B21. Its service spare is 850881-001 and the assembly code on the module is 840758-091. The -S21 suffix is used for an alternative listing of the 815100 kit; we treat it as the same 32GB 2Rx4 DDR4-2666 module, but if your purchasing rules depend on the exact suffix, please confirm with our team before ordering.

Exact matching matters with Gen10 memory. HPE sold 32GB DDR4 modules at 2666, 2933 and 3200, plus load reduced versions. The speed, buffer type and processor support all need to line up with your server.

HPE Smart Memory And Gen10 Channel Layout

HPE calls its qualified memory Smart Memory. When a server boots, it can recognise genuine HPE modules and apply the tuned settings HPE tested them with. Third-party DIMMs may still work, but they do not get the same level of support from HPE.

Each first generation Xeon Scalable processor in a Gen10 server has six memory channels, with up to two DIMMs per channel. For full bandwidth, populate all six channels on each processor with the same module. That means 6 or 12 DIMMs per processor rather than 4 or 8. Uneven counts still work, but memory performance can drop noticeably.

Second generation Xeon Scalable processors support faster memory, but they will run a DDR4-2666 module at 2666. If your server has been upgraded to newer processors, check the memory list for that processor before mixing old and new DIMMs.

New HPE 815100-S21

New modules suit customers adding matched sets to Gen10 servers in production. Warranty terms for new units are given on the product page.

Refurbished HPE 815100-S21

Refurbished stock is a sound choice for replacing a single failed module or extending memory in a Gen10 server that is well into its service life. The product page explains the condition and warranty for refurbished modules.

Gen10 Compatibility

• HPE ProLiant DL360 Gen10 and DL380 Gen10
• HPE ProLiant DL560 Gen10 and DL580 Gen10
• HPE ProLiant ML350 Gen10 and ML110 Gen10
• HPE ProLiant BL460c Gen10

These systems are listed with first generation Xeon Scalable processors. Look at the label on one of your existing DIMMs and confirm the server model before you buy. Gen10 Plus and Gen11 servers use different memory and are not covered by this module.

Related Numbers In The 815100 Family

• HPE 815100-B21 is the main option kit number for this 32GB module.
• HPE 850881-001 is the spare part number.
• HPE 840758-091 is the assembly code usually printed on the label.
• HPE 840758-191 PC4-21300 memory is a closely numbered DDR4-2666 module; confirm its details before treating it as identical.
• HPE 815098-B21 16GB DDR4-2666 kit is a smaller module at the same speed.
• HPE 815101-B21 64GB DDR4-2666 kit and HPE 850882-001 64GB DDR4-2666 module offer more capacity per slot.

How To Check This Is The Right Memory

1. Read the sticker on a fitted DIMM for 840758-091, 850881-001, 815100-B21 or 32GB 2Rx4 PC4-2666V-R.
2. Confirm the server is a Gen10 model, not Gen10 Plus.
3. Check the processor generation in the iLO system information page.
4. Make sure the server uses registered memory, with no LRDIMMs fitted.
5. Plan the number of modules so each processor has 6 or 12 DIMMs where possible.

Replacing Versus Upgrading

If iLO flags a single DIMM as degraded, replacing just that module restores full protection quickly. If you are adding memory at the same time, consider moving to a full set of 12 per processor rather than a few extra DIMMs, so the channels stay balanced. Record which slots changed and re-check the memory summary in iLO after the first boot.

Buying HPE 815100-S21 in the UK

Euroland IT Store serves businesses, IT teams, resellers and repair specialists right across the UK. Please check condition, warranty, stock and delivery information on the product page. UK mainland orders that exceed £100 + VAT are delivered with no shipping fee. For a quick compatibility check, send your server model, processor type and the part number on your existing DIMM, or call 0203 209 6002.

Frequently Asked Questions

Is 815100-S21 the same as 815100-B21?

Both numbers belong to the HPE 815100 family of 32GB 2Rx4 DDR4-2666 registered modules, and our team can confirm the exact suffix details if your order requires it.

Which servers is this 32GB module compatible with?

It is listed for Gen10 servers with first generation Xeon Scalable processors, including the DL360, DL380, DL560, DL580, ML350, ML110 and BL460c Gen10.

Should I buy New or Refurbished memory for a Gen10 server?

New suits matched production upgrades, and Refurbished keeps costs low for single replacements or older Gen10 servers.

What warranty does the 815100-S21 have?

Our product page for this Gen10 DIMM sets out separate warranty terms for New and Refurbished units.

How does UK delivery work?

We deliver across the UK, orders over £100 + VAT ship free to the UK mainland, and the product page gives delivery details.