HPE ProLiant DL380 Gen9 Memory
Genuine HPE SmartMemory for the HPE ProLiant DL380 Gen9, new and refurbished, tested before shipping. The platform carries 24 DDR4 DIMM slots — 12 per processor, four channels each, three per channel — and the processor family sets both the speed they start at and how far they fall as the channels fill.
DL380 Gen9 Memory Specifications
- Memory type: HPE SmartMemory DDR4 Registered (RDIMM), Load Reduced (LRDIMM) and Persistent Memory (NVDIMM) — distinct technologies that cannot be mixed in one server
- Slots and channels: 24 slots, 12 per processor, four channels per processor, three slots per channel; one processor exposes only half of them
- Maximum capacity: 3TB on 24 × 128GB LRDIMMs at 2400MHz, 768GB on 24 × 32GB RDIMMs, and 128GB on 16 × 8GB NVDIMMs (E5-2600 v4 only)
- Module range: single-rank and dual-rank RDIMMs from 8GB to 32GB, plus 64GB quad-rank and 128GB octal-rank LRDIMMs
- Speed by family: E5-2600 v3 parts rate memory at 1600, 1866 or 2133 MT/s; E5-2600 v4 parts at 1866, 2133 or 2400 MT/s
- Mixing rules: RDIMM and LRDIMM may not be mixed, nor 2133 and 2400MHz DIMMs, nor the 128GB LRDIMM with other capacities or types
Rank decides where the speed drops. On E5-2600 v4 processors a single-rank RDIMM steps down from 2400 to 2133 MT/s at two DIMMs per channel and to 1866 at three; dual-rank RDIMMs hold 2400 to two per channel, then fall to 1866. The 64GB quad-rank and 128GB octal-rank LRDIMMs hold 2400 MT/s at three per channel — the only parts that fill 24 slots without a step-down.
How far does DL380 Gen9 memory speed drop as the channels fill?
| DIMM type (E5-2600 v4 unless noted) | 1 DIMM/channel | 2 DIMMs/channel | 3 DIMMs/channel |
|---|---|---|---|
| 8GB and 16GB single-rank RDIMM | 2400 | 2133 | 1866 |
| 16GB and 32GB dual-rank RDIMM | 2400 | 2400 | 1866 |
| 64GB quad-rank LRDIMM | 2400 | 2400 | 2400 |
| 128GB octal-rank LRDIMM | 2400 | 2400 | 2400 |
| DDR4-2133 RDIMM on E5-2600 v3 | 2133 | 2133 | 1600 |
Two things move the number. Rank is one: a single-rank RDIMM steps down at two DIMMs per channel, while the LRDIMMs hold 2400 MT/s all the way to three. The processor is the other, and it caps everything above it — an E5-2603 v4 or E5-2609 v4 runs memory at 1866 MT/s whatever DIMM is fitted.
Choosing the Right DL380 Gen9 Memory
- Check the processor before the DIMM. HPE rates E5-2603 and E5-2609 parts lowest, the E5-2620 to E5-2640 class a tier up, and E5-2643 and above at the family maximum.
- Filling every slot costs speed on RDIMMs. Three per channel drops an E5-2600 v4 server to 1866 MT/s; only LRDIMMs fill 24 slots at full rate.
- Population order matters. Fill white slots first for one DIMM per channel, balance capacity across both processors, and put the heaviest-ranked DIMM furthest from the processor.
- Do not reuse older HPE memory. HPE states memory from previous generation servers is not compatible with the DL380 Gen9, and that SmartMemory is required for the documented performance.
- Background reading: memory rank in HPE servers, why memory speed matters and what CAS latency means.
Complete Your DL380 Gen9 Build
Pair memory with DL380 Gen9 processors, drives, storage controllers, adapters and power supplies, or the full DL380 Gen9 parts page. Neighbors: DL360 Gen9 parts and DL380 Gen10 parts. Catalog-wide: all Gen9 server memory and parts by server model.
DL380 Gen9 Memory FAQ
How many DIMM slots does the HPE ProLiant DL380 Gen9 have?
Twenty-four - twelve per processor, four memory channels per processor and three DIMM slots per channel. If only one processor is installed, only half of the slots are available; both processors must be fitted to reach all 24.
What is the maximum RAM in a DL380 Gen9?
HPE quotes 3TB from 24 x 128GB LRDIMMs at 2400MHz and 768GB from 24 x 32GB RDIMMs at 2400MHz. NVDIMM configurations top out at 128GB from 16 x 8GB modules. The 128GB LRDIMM cannot be mixed with other capacities or DIMM types.
Why does my DL380 Gen9 memory run slower when every slot is filled?
Because the third DIMM on a channel forces a step-down. On E5-2600 v4 processors, RDIMMs drop from 2400 to 1866 MT/s at three DIMMs per channel, and single-rank RDIMMs already drop to 2133 at two per channel. The 64GB and 128GB LRDIMMs hold 2400 MT/s at three per channel.
Can I mix RDIMMs and LRDIMMs in a DL380 Gen9?
No. HPE states that RDIMM and LRDIMM are distinct memory technologies and cannot be mixed within a server, and that mixing 2133 and 2400MHz DIMMs is not supported either. DIMMs of different speeds that are otherwise compatible run at a common optimal speed.
Does the processor limit DL380 Gen9 memory speed?
Yes, and it is the hard ceiling. HPE lists E5-2609 v4 and E5-2603 v4 at 1866 MT/s, the E5-2620 v4 class at 2133 MT/s and the E5-2643 v4 and above at 2400 MT/s. The v3 equivalents sit one tier lower at 1600, 1866 and 2133 MT/s.
Will memory from an older HPE ProLiant fit the DL380 Gen9?
No. This is a DDR4 platform, and HPE states that memory from previous generation servers is not compatible with the DL380 Gen9 and that certain SmartMemory features such as memory authentication may not be supported.
✅ Looking for a specific DL380 Gen9 memory module? Browse our full selection below.
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