HPE 840760-091 128GB DDR4-2666MHZ Memory

HPE 840760-091 128GB DDR4-2666 3DS Load Reduced Memory

At 128GB on a single stick, the HPE 840760-091 is one of the largest DDR4 modules made for ProLiant Gen10. The number is the assembly code printed on the DIMM label, and it belongs to HPE option kit 815102-B21, whose service spare is 850883-001.

The module is a load reduced DIMM built with 3DS (three dimensional stacked) DRAM. Stacking several memory dies inside each package is what allows HPE to fit 128GB onto one standard 288-pin DIMM.

Euroland IT Store can supply the 840760-091 as a New or Refurbished part, subject to stock.

Key Features At A Glance

• 128GB on one DIMM for very large memory footprints
• 3DS stacked DRAM on a load reduced design
• Assembly number for HPE kit 815102-B21
• Rated for DDR4-2666 in ProLiant Gen10 servers
• HPE SmartMemory with ECC error correction
• New and Refurbished options, stock permitting

What 3DS and Octal Rank Mean

The label on this module reads 128GB 8Rx4 PC4-2666V-L, and some suppliers write the rank as 2S4Rx4. Both describe the same layout: four logical ranks, each built from a stack of two DRAM dies, giving eight ranks in total. The trailing “L” confirms it is a load reduced module.

That density comes with slightly looser timings than smaller DDR4-2666 registered DIMMs. The 840760-091 runs at CL22, compared with CL19 on typical 32GB registered parts, which is normal for high capacity 3DS memory.

Assembly, Option and Spare Numbers

The 840760-091 is the code you will normally read on a fitted DIMM. If you are ordering through HPE, the retail kit is 815102-B21 and the service spare is 850883-001. All three refer to the same 128GB module, so any of them can be used to find the right replacement.

Be careful with a similar code, 840760-191. Spares references list it as a functional equivalent tied to a different option kit, so if your existing label ends in -191 please send us the details before ordering.

Population Rules for 128GB LRDIMMs

• Do not mix load reduced DIMMs with registered DIMMs in the same server.
• Use identical 128GB modules across a processor’s channels to keep memory balanced.
• Follow the slot order in your server’s HPE memory population guide.
• Expect the working speed to depend on the processor and the number of DIMMs per channel.

New HPE 840760-091

An unused module is available through the New option. Select it to see the current price and the warranty that applies.

Refurbished HPE 840760-091

The Refurbished option is a previously used module that can bring the cost of a large memory upgrade down. Its condition and warranty are shown when you choose it on this page.

840760-091 Technical Specifications

Supported HPE Gen10 Servers

The 815102-B21 kit is listed by at least two spares references for these Gen10 systems:

• HPE ProLiant DL360 Gen10, DL380 Gen10, DL560 Gen10 and DL580 Gen10
• HPE ProLiant ML110 Gen10 and ML350 Gen10
• HPE ProLiant BL460c Gen10 server blade
• HPE Apollo XL170r and XL190r Gen10

These listings refer to servers with first generation Intel Xeon Scalable processors. If your server, such as a HPE P20172-B21 DL380 Gen10 2U server, has a later processor, ask us to confirm support first.

Related High Capacity Memory

• HPE 815102-B21 128GB DDR4-2666 option kit
• HPE 850883-001 128GB DDR4-2666 spare
• HPE 840759-091 64GB DDR4-2666 load reduced memory
• Server memory kits for HPE and other brands

How to Confirm the Part

• Check the DIMM label for 840760-091 and the 128GB 8Rx4 PC4-2666V-L marking.
• Confirm your server is a ProLiant Gen10 model and note the processor fitted.
• Make sure all other installed DIMMs are load reduced, not registered.
• Look for a -191 suffix, which points to a different kit.

Buying HPE 840760-091 in the UK

Euroland IT Store supplies large capacity server memory to data centres, cloud providers, IT departments and resellers across the UK. UK delivery is available, and the options and costs appear at checkout.

Planning a big upgrade? Share your server model, serial number and the label details from a current DIMM, and we will help you check the configuration before you buy.

Frequently Asked Questions

What does 8Rx4 mean on the 840760-091 label?

It means eight ranks built from x4 DRAM chips. The module uses 3DS stacking, so it is also written as 2S4Rx4: four ranks, each made of a two-die stack.

Is 840760-091 the same module as 815102-B21?

Yes. 840760-091 is the assembly number on the DIMM, 815102-B21 is the HPE option kit and 850883-001 is the spare number. All three refer to the same 128GB DDR4-2666 LRDIMM.

Can I add this 128GB module to a server running 32GB RDIMMs?

No. HPE does not support mixing load reduced and registered DIMMs in one server. To move to 128GB LRDIMMs, the registered modules need to be removed.

Are the New and Refurbished versions the same part?

Yes, both are the same 840760-091 module. New is unused and Refurbished has been used before. Check the condition and warranty shown when you select each option.

Is UK delivery available for this memory?

Yes, we deliver throughout the UK. The available options and costs are shown at checkout before you place your order.