HPE ProLiant DL380 Gen12 Memory
Upgrade your HPE ProLiant DL380 Gen12 with genuine HPE DDR5 Smart Memory, in stock new and refurbished and tested before shipping. The Gen12 platform runs DDR5-6400 across 32 DIMM slots — a full speed grade past the Gen11's DDR5-4800/5600.
DL380 Gen12 Memory Specifications
- Slots: 32 DIMM slots — 16 per processor, 8 channels per CPU, 2 DIMMs per channel (16 slots usable with one processor)
- Memory type: HPE DDR5 Smart Memory, EC8 Registered (RDIMM)
- Speed: 6400 MT/s at 1 DIMM per channel, 6000 MT/s at 2 DIMMs per channel — and always limited by the processor: many Xeon 6 models run DDR5 at 6400, some E-core models at 5600
- Supported modules: 16GB single-rank, 32GB dual-rank x8, 64GB / 96GB / 128GB dual-rank x4, and 256GB quad-rank 3DS
- Maximum capacity: 8TB — 32 × 256GB
- Not supported: LRDIMM, UDIMM, non-ECC, and DDR4 from earlier generations
Before you order, do the speed math. The DL380 Gen12 runs DDR5-6400 at one DIMM per channel, steps to 6000 MT/s with both slots filled, and the processor sets the ceiling — some Xeon 6 E-core models run memory at 5600 MT/s. The 16GB kit is supported in 1-DIMM-per-channel configurations only.
How much memory can the DL380 Gen12 hold?
| Configuration | Total capacity | Notes |
|---|---|---|
| 8 × 32GB (2 CPUs) | 256GB | Entry build, one bank per processor |
| 16 × 64GB (2 CPUs) | 1TB | Full 6400 MT/s at 1 DIMM per channel |
| 32 × 64GB (2 CPUs, all slots) | 2TB | Slots full — speed steps to 6000 MT/s |
| 32 × 128GB (2 CPUs, all slots) | 4TB | Large virtualization and database builds |
| 32 × 256GB 3DS (2 CPUs, all slots) | 8TB | Platform maximum |
The 64GB DDR5-6400 kit is the sweet spot for most builds — full-speed dual-rank modules that reach 2TB with every slot filled. Go to 128GB or 256GB 3DS modules when the workload genuinely needs 4–8TB. As on every DDR5 platform, delivered speed is the lowest of the CPU's rating, the population, and the slowest module installed.
Choosing the Right DL380 Gen12 Memory
- Populate both processors identically and in even quantities — unbalanced layouts starve one socket of local bandwidth.
- Watch the 16GB kit's rule: HPE supports it in 1-DIMM-per-channel configurations only.
- Don't mix capacities or ranks within a bank, and match kits across channels for predictable speed.
- Order the stand-alone SKU type: field upgrades and spares use -B21 part numbers (what we stock); -F21 SKUs are factory-integration only.
- Background reading: maximum memory configurations for Gen12 ProLiants, memory rank in HPE servers, and why memory prices are up in 2026.
Complete Your DL380 Gen12 Build
Pair memory with DL380 Gen12 processors, drives, storage controllers, networking adapters, and power supplies, or start from the full DL380 Gen12 parts page. Running the previous generation? See DL380 Gen11 memory. You can also browse all Gen12 server memory or parts by server model.
DL380 Gen12 Memory FAQ
How much RAM does the HPE ProLiant DL380 Gen12 support?
Up to 8TB of DDR5 - 256GB 3DS RDIMMs in all 32 slots with two processors installed. With one processor, 16 slots are available for up to 4TB.
What type of memory does the DL380 Gen12 use?
HPE DDR5 Smart Memory - EC8 Registered DIMMs (RDIMMs) at up to 6400 MT/s, in 16GB, 32GB, 64GB, 96GB, 128GB, and 256GB 3DS capacities. LRDIMM, UDIMM, non-ECC, and DDR4 memory are not supported.
What is the maximum memory speed of the DL380 Gen12?
6400 MT/s with one DIMM per channel, stepping down to 6000 MT/s with two DIMMs per channel - and the processor sets the ceiling: many Xeon 6 models support DDR5-6400, while some E-core models run at 5600 MT/s.
Can I use DL380 Gen11 memory in the DL380 Gen12?
Only if the exact HPE part number is listed for both platforms. Gen11 servers use DDR5-4800/5600 kits while Gen12 lists DDR5-6400 kits, so most Gen11 modules are not the right speed grade for this server - always match the Gen12 QuickSpecs part numbers.
Do DL380 Gen12 DIMMs need to be installed in matched sets?
Yes, in practice. Install even quantities, keep both processors' populations identical, and use the same capacity and rank within a bank. The 16GB kit is the strictest - HPE supports it at one DIMM per channel only.
Why would 6400 MT/s memory run slower than 6400 in my server?
Delivered speed is the lowest of three limits: the CPU's supported speed (some Xeon 6 E-core models top out at 5600 MT/s), the population (two DIMMs per channel steps 6400 down to 6000), and the slowest module installed. That step-down is normal DDR5 behavior, not a fault.
✅ Looking for a specific DL380 Gen12 memory module? Browse our full selection below.
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