HPE 815102-B21 128GB DDR4-2666MHZ Memory

HPE 815102-B21 128GB DDR4-2666 3DS Load Reduced Memory Kit

The HPE 815102-B21 is a 128GB DDR4-2666 memory kit for HPE ProLiant Gen10 servers. The single module inside is an octal rank x4 load reduced DIMM built with 3DS stacked DRAM, rated PC4-2666V-L, with CAS latency 22, ECC and 1.2V operation.

This is the top capacity option in HPE’s DDR4-2666 range. It is chosen for Gen10 hosts where memory is the limit: dense virtual desktop farms, large virtual machine estates, in-memory analytics and big relational databases.

Euroland IT Store supplies the 815102-B21 as New or Refurbished, depending on current stock; you can browse more server parts from the Euroland IT Store homepage.

HPE 815102-B21 Technical Specifications

What Is The HPE 815102-B21?

815102-B21 is the option kit, the number used for a boxed upgrade. HPE lists 850883-001 as the spare part and 840760-091 as the assembly number for the same 128GB module. If your existing DIMMs show either of those codes, this kit is the matching option.

HPE also produced other 128GB DDR4 modules for later processors and faster speeds, such as DDR4-2933 kits. They are not the same part. Ordering by the exact number keeps speed, buffering and firmware support consistent within your server.

What 3DS Stacking Does

3DS stands for three dimensional stacking. Instead of placing every DRAM die side by side on the module, several dies are stacked in one package and linked by through-silicon vias. This is how HPE fits 128GB onto a single standard height DIMM.

The module is described as 8Rx4, sometimes shown as 2S4Rx4: four physical ranks, each made of two-high stacks, giving eight logical ranks. The load reduced buffer then hides that complexity from the processor. The cost is a higher CAS latency than smaller RDIMMs, 22 cycles compared with 19, which is a fair trade when the goal is maximum capacity.

Processor Memory Limits On Gen10

Capacity at this scale can run into processor limits before slot limits. First generation Xeon Scalable processors without the M suffix support up to 768GB per socket. M suffix models raise that to 1.5TB. With six 128GB modules per processor you already reach 768GB, so a full set of twelve needs M processors. Check the processor model in iLO before planning a large upgrade.

As with all LRDIMMs, these modules must not be mixed with registered DIMMs. Keep the same capacity and type across every channel for the best result.

New HPE 815102-B21

New kits are the safe choice when building a high memory host from scratch, where every module should be unused and identical. The product page gives the warranty for new kits.

Refurbished HPE 815102-B21

Because 128GB modules are expensive, Refurbished stock can cut the cost of a large Gen10 memory build considerably. It is also handy for replacing a failed module in an existing set. Refurbished condition and warranty are shown on the product page.

Compatibility

• HPE ProLiant Gen10 servers that support DDR4-2666 load reduced memory
• Systems running first generation Xeon Scalable processors

We have not been able to confirm a complete server list for this kit, so please check your exact model in HPE’s QuickSpecs or ask our team. Read the label on a fitted DIMM, confirm the processor model and make sure the server is not already using registered memory.

Related Part Numbers

• HPE 850883-001 is the spare part number for this 128GB module.
• HPE 840760-091 is the assembly number for the same module.
• HPE 840759-091 64GB DDR4-2666 memory is a 64GB module at the same speed, by its title.
• HPE P16001-001 128GB DDR4-2933 kit is a faster 128GB part for later processors and is not a direct substitute.
• HPE 838079-B21 8GB DDR4-2666 kit, HPE 840755-091 8GB DDR4-2666 module and HPE 850879-001 8GB DDR4-2666 module are small DDR4-2666 listings for lighter workloads.

Before You Order

• Your current module label reads 815102-B21, 850883-001, 840760-091 or 128GB 8Rx4 PC4-2666V-L.
• The server is a Gen10 model, not Gen10 Plus.
• The processor model supports the total memory you plan to fit.
• No registered DIMMs remain in the server.
• You have enough identical kits to populate channels evenly on each processor.

Buying HPE 815102-B21 in the UK

Euroland IT Store has supplied businesses, IT teams, resellers and repairers around the UK since 2002. For this 3DS kit, the product page carries the condition notes, warranty, stock level and delivery details. Orders worth over £100 + VAT qualify for free delivery to UK mainland addresses. Contact us with your server model, processor and the code from your current memory and we will help confirm the right kit, or call 0203 209 6002.

Frequently Asked Questions

Does the 815102-B21 work in a Gen10 server?

Yes, it is a Gen10 memory kit for servers with first generation Xeon Scalable processors, so confirm your model and processor before ordering.

What do 3DS and 8Rx4 mean on this kit?

3DS means the DRAM dies are stacked inside each package, and 8Rx4 means the module presents eight logical ranks built from x4 chips.

Is a Refurbished 128GB module worth considering?

Refurbished can lower the cost of a large upgrade significantly, while New suits buyers who need every module unused.

Where is the warranty information?

The warranty for New and Refurbished stock is shown on the product page.

Do you offer free UK delivery on this kit?

Yes, orders over £100 + VAT qualify for free UK mainland delivery, and the product page lists delivery details.