HPE 840758-191 PC4-21300 DDR4-2666MHz Memory

HPE 840758-191 32GB PC4-2666V Registered Memory for AMD Gen10 Servers

Printed on the module label, HPE 840758-191 is the assembly number of a 32GB dual rank DDR4-2666 registered DIMM. Spares references link it to the HPE option kit 838083-B21 and to the spare part number 868843-001, a kit listed for AMD EPYC based ProLiant Gen10 servers such as the DL325 Gen10 and DL385 Gen10.

Because the assembly number is what you see on the sticker of a fitted module, it is often the quickest way to identify a replacement. Search engines and spares lists may show it as 840758-191, while HPE ordering systems use the option or spare number.

Euroland IT Store offers this module in New and Refurbished condition, as stock allows.

Key Features At A Glance

• 32GB registered DDR4 module rated at 2666 MT/s
• Assembly number for HPE option kit 838083-B21
• Listed for AMD EPYC ProLiant DL325 Gen10 and DL385 Gen10
• ECC protection for always-on server workloads
• Standard 1.2V DDR4 operation
• Choose New or Refurbished, subject to stock

Reading the 840758-191 Label

HPE uses three numbers for one physical module. The option kit (838083-B21) is the retail product, the spare (868843-001) is used for service orders, and the assembly (840758-191) is the build number on the DIMM itself. All three describe the same 32GB 2Rx4 PC4-2666V-R part.

The suffix is worth checking closely. Assembly 840758-091 belongs to a different kit, the 815100-B21 32GB DDR4-2666 registered module sold for Intel Xeon based Gen10 servers, which uses spare 850881-001. The “-191” version is the one tied to the AMD platform kit. The specifications look the same on paper, so check the label and your server’s QuickSpecs rather than relying on capacity and speed alone.

AMD EPYC Platforms and Memory Speed

The DL325 Gen10 and DL385 Gen10 were launched with first generation AMD EPYC 7001 series processors, which provide eight memory channels per socket. Later configurations with second generation EPYC processors are specified with newer DDR4-2933 kits, so check which processors your server has. The 2666 MT/s rating is the module’s maximum. The speed you actually get depends on the processor model and how many DIMMs share each channel, so a fully populated server may run memory more slowly than one with a single DIMM per channel.

For best results, populate channels evenly across every processor, keep to one DIMM type throughout, and do not combine registered modules with load reduced DIMMs.

New 840758-191 Memory

Pick the New option if your project calls for an unused module. Price and warranty details for it appear once you select it on this page.

Refurbished 840758-191 Memory

For lower cost repairs or spare stock, the Refurbished option offers a previously used module. Selecting it shows the condition and warranty that apply, so you can compare before ordering.

840758-191 Technical Specifications

Server Compatibility

Spares references list the 838083-B21 kit, and therefore this 840758-191 module, for:

• HPE ProLiant DL325 Gen10
• HPE ProLiant DL385 Gen10

Our listing also names the DL360 Gen10 and DL380 Gen10. Those are Intel Xeon servers, and HPE normally specifies the 815100-B21 kit for them, so please contact us before using this module in an Intel Gen10 system. If you are building out a DL385 Gen10, processors such as the HPE P00654-001 AMD EPYC 7351 processor and the HPE 881074-001 DL385 Gen10 2U heatsink are also available.

Related Parts

• HPE 868843-001 32GB DDR4-2666 memory, the spare number for the same kit
• HPE 838089-B21 16GB DDR4-2666 registered kit for AMD Gen10 servers
• HPE P06775-001 DL325 standard 1U heatsink
• See more HPE server parts

Quick Identification Checklist

• Find 840758-191, 868843-001 or 838083-B21 on the module or kit label.
• Confirm the marking reads 32GB 2Rx4 PC4-2666V-R.
• Check the server is an AMD EPYC Gen10 model, such as the DL325 or DL385 Gen10.
• Make sure no load reduced DIMMs are already installed.

Buying HPE 840758-191 in the UK

Euroland IT Store supplies HPE memory and server spares to businesses, IT maintainers and resellers across the UK. UK delivery is available, with options and costs shown at checkout.

Not sure whether you need the -091 or -191 version? Tell us your server model and serial number, along with the label text from a fitted DIMM, and we will help you choose.

Frequently Asked Questions

How is 840758-191 different from 840758-091?

Both are 32GB 2Rx4 DDR4-2666 registered assemblies, but 840758-191 belongs to option kit 838083-B21 for AMD EPYC Gen10 servers, while 840758-091 belongs to 815100-B21, the kit sold for Intel Xeon Gen10 servers.

Which servers is the 840758-191 listed for?

Spares references list it for the HPE ProLiant DL325 Gen10 and DL385 Gen10. For other Gen10 models, please send us your server details so we can check.

Will the module always run at 2666 MT/s?

2666 MT/s is the maximum rating. The actual speed depends on the processor fitted and how many DIMMs are installed per channel.

Should I choose a New or Refurbished module?

New suits projects that need an unused part, while Refurbished is a lower cost, previously used option. The condition and warranty for each are shown when you select it on this page.

Do you ship this memory to addresses across the UK?

Yes. UK delivery is available, and you can see the delivery options and costs at checkout.