The maximum memory configuration of an HPE ProLiant Gen11 server ranges from 8TB on a dual-socket Intel Xeon Scalable system like the DL380 Gen11 down to 128GB on an entry-level ML30 Gen11 — and the supported memory type, speed, and capacity depend entirely on which processor family the server runs. This guide details the maximum memory configuration for every HPE ProLiant Gen11 server across its three memory families (Intel Xeon Scalable, AMD EPYC, and entry-level Intel Xeon E), so you can plan a full-capacity upgrade without compatibility surprises.
Maximum Memory by HPE ProLiant Gen11 Model
The table below shows the maximum memory configuration of each HPE ProLiant Gen11 server, along with its DIMM type, slot count, and supported speeds. The two speed figures reflect the processor generations within each family (4th Gen / 5th Gen Intel; Genoa / Turin for AMD; Xeon E / Xeon 6 for entry).
| Server Model | Sockets | DIMM Slots | Channels / CPU | Memory Type | Maximum Memory | Max Speed (MT/s) |
|---|---|---|---|---|---|---|
| DL320 Gen11 | 1 | 16 | 8 | DDR5 RDIMM | 2TB | 4800 / 5600 |
| DL360 Gen11 | 2 | 32 | 8 | DDR5 RDIMM | 8TB | 4800 / 5600 |
| DL380 Gen11 | 2 | 32 | 8 | DDR5 RDIMM | 8TB | 4800 / 5600 |
| ML350 Gen11 | 2 | 32 | 8 | DDR5 RDIMM | 8TB | 4800 / 5600 |
| DL325 Gen11 | 1 | 12 | 12 | DDR5 RDIMM / 3DS | 3TB | 4800 / 6400 |
| DL345 Gen11 | 1 | 12 | 12 | DDR5 RDIMM / 3DS | 3TB | 4800 / 6400 |
| DL385 Gen11 | 2 | 24 | 12 | DDR5 RDIMM / 3DS | 6TB | 4800 / 6000 |
| ML30 Gen11 | 1 | 4 | 2 | DDR5 ECC UDIMM | 128GB | 4400 / 4800 |
| DL20 Gen11 | 1 | 4 | 2 | DDR5 ECC UDIMM | 128GB | 4400 / 4800 |
Notes: The DL320 Gen11 reaches its 2TB maximum with 128GB modules (256GB DIMMs are not supported on that platform). The largest module is 256GB on the other RDIMM servers and 32GB on the UDIMM entry servers. On the dual-socket DL385, 5th Gen EPYC (Turin) DIMMs are rated 6400 MT/s but operate at up to 6000 MT/s in this 2-socket platform.
The Three Gen11 Memory Families
Almost every memory mistake on Gen11 hardware comes from assuming one set of rules applies to every server. It doesn't. HPE ProLiant Gen11 servers fall into three distinct memory architectures, and the maximum configuration follows from which one you have:
- Intel Xeon Scalable (RDIMM, 8 channels per CPU) — the mainstream rack and tower servers (DL320, DL360, DL380, ML350). These use DDR5 ECC Registered (RDIMM) memory and run up to 4800 MT/s with 4th Gen Intel Xeon or up to 5600 MT/s with 5th Gen Intel Xeon Scalable processors.
- AMD EPYC (RDIMM/3DS, 12 channels per CPU) — the EPYC-based servers (DL325, DL345, DL385). These also use DDR5 ECC Registered (RDIMM, with 3DS RDIMM for the largest modules), but they have 12 memory channels per processor and run up to 4800 MT/s with 4th Gen EPYC 9004 (Genoa) or up to 6400 MT/s with 5th Gen EPYC 9005 (Turin).
- Intel Xeon E entry (ECC UDIMM, 2 channels) — the small-business tower and 1U servers (ML30, DL20). These use DDR5 ECC Unbuffered (UDIMM) memory — not RDIMM — in 16GB and 32GB modules only, up to 128GB total.
Registered (RDIMM) and Unbuffered (UDIMM) modules are not interchangeable, and no Gen11 server uses Load-Reduced (LRDIMM) memory. Match the family first, then the capacity and speed.
DDR5 Smart Memory Features
Gen11 servers use HPE DDR5 Smart Memory (and HPE Standard Memory on the entry servers), which delivers higher bandwidth, greater density, and improved power efficiency than the DDR4 used in previous generations. On the RDIMM-based servers, the memory subsystem includes Advanced ECC and HPE Fast Fault Tolerant Memory (ADDDC) for high reliability, with additional RAS features such as online spare and memory mirroring available depending on the platform and configuration. The entry Xeon E servers support ECC for single-bit error correction but do not offer the full RAS feature set of the larger platforms.
Memory Speed Depends on Your Processor
On every Gen11 server, the maximum memory speed is set by the processor, not the DIMM alone. Install memory rated at or above what your CPU supports, and keep speed grades consistent — the system runs all installed memory at the speed of the slowest module. By family:
- Intel Xeon Scalable: up to 4800 MT/s with 4th Gen (Sapphire Rapids), up to 5600 MT/s with 5th Gen (Emerald Rapids). HPE pairs 4800-rated DIMMs with 4th Gen CPUs and 5600-rated DIMMs with 5th Gen CPUs, and mixing the two speed grades is not supported.
- AMD EPYC: up to 4800 MT/s with 4th Gen EPYC 9004 (Genoa), up to 6400 MT/s with 5th Gen EPYC 9005 (Turin). On the dual-socket DL385, Turin memory operates at up to 6000 MT/s.
- Intel Xeon E entry: up to 4400 MT/s with Intel Xeon E-2400 processors, up to 4800 MT/s with Intel Xeon 6300 (Xeon 6) processors.
Filling both slots in a channel (2 DIMMs per channel) on the RDIMM servers also steps the speed down a tier. If you're not sure which processor generation your server has, check the CPU model in HPE iLO before ordering.
Supported DIMM Types
The correct DIMM type is determined by the server family:
- DDR5 ECC Registered (RDIMM) — required on all Intel Xeon Scalable and AMD EPYC Gen11 servers. Capacities of 16GB, 32GB, 64GB, 128GB, and 256GB are available (the DL320 Gen11 tops out at 128GB). On the AMD servers, the 256GB modules are 3DS RDIMM.
- DDR5 ECC Unbuffered (UDIMM) — required on the Intel Xeon E entry servers (ML30, DL20), available in 16GB and 32GB.
Two compatibility rules apply across the whole Gen11 line: Load-Reduced DIMMs (LRDIMMs) are not used in any Gen11 server, and non-ECC memory is not supported. The mainstream and EPYC servers do not accept unbuffered modules, and the entry servers do not accept registered modules — so always confirm whether your server takes RDIMM or UDIMM before buying. For best performance, use uniform DIMMs of the same capacity and rank across all channels.
Maximum Memory Configurations by Server Family
Reaching the maximum memory configuration means populating every available DIMM slot with the largest qualified module. How you get there depends on the family:
Intel Xeon Scalable Servers (up to 8TB)
The dual-socket DL360, DL380, and ML350 Gen11 each reach their 8TB maximum by populating all 32 DIMM slots with 256GB RDIMMs — 16 modules per processor across 8 channels, 2 DIMMs per channel. The single-socket DL320 Gen11 reaches its 2TB maximum with 16 × 128GB modules; 256GB DIMMs are not qualified on that platform, so 128GB is the largest module it accepts. Because these are dual-socket designs (except the DL320), both processors must be installed to access all 32 slots — a single CPU exposes only half the slots and half the maximum capacity.
AMD EPYC Servers (up to 6TB)
The single-socket DL325 and DL345 Gen11 reach 3TB with 12 × 256GB modules across all 12 AMD memory channels. The dual-socket DL385 Gen11 doubles that to a 6TB maximum with 24 × 256GB modules (12 per processor). Capacity scales per processor on the DL385, so a single-CPU configuration is limited to 12 slots and 3TB until the second processor is added.
Entry Xeon E Servers (up to 128GB)
The ML30 and DL20 Gen11 reach their 128GB maximum with 4 × 32GB DDR5 ECC UDIMMs across the 4 DIMM slots. These servers require ECC unbuffered memory and do not accept registered, load-reduced, or non-ECC modules.
One planning note for maximum-capacity builds: the largest 256GB modules can carry additional cooling requirements, such as a high-performance or redundant fan configuration and a lower maximum inlet temperature. Check your server's QuickSpecs or population guide before finalizing an 8TB or 6TB configuration.
Memory Installation & Population Rules
Whatever the family, two principles always apply: begin by filling the white-labeled DIMM slot in each channel, and use identical modules across channels for balanced performance. On dual-socket servers, balance memory evenly across both processors. Beyond that, population order and supported DIMM quantities differ by CPU family, so use HPE's population guide for your platform:
- Intel Xeon Scalable servers: HPE Gen11 Memory Population Rules — Intel Xeon Scalable (PDF)
- AMD EPYC servers: HPE Gen11 Memory Population Rules — AMD EPYC (PDF)
- Intel Xeon E entry servers: HPE Gen11 Memory Population Rules — Intel Xeon E-2400 (PDF)
How to Upgrade Gen11 Server Memory
- Confirm your memory family. Identify whether your server takes DDR5 RDIMM (Intel Xeon Scalable and AMD EPYC servers) or DDR5 ECC UDIMM (ML30/DL20 entry servers), and confirm your processor generation, which determines the supported speed.
- Power down and prepare. Shut down the server completely, unplug all power sources, and wait at least 30 seconds before opening the chassis.
- Access the DIMM slots. Open the server cover and locate the memory slots beside the processor(s).
- Verify compatibility. Make sure the new modules match your server's required type, capacity, and speed grade, and that they're identical to the existing modules where possible.
- Install the modules. Populate the white-labeled slots first to distribute memory evenly across channels, and press each module firmly until the latches click into place.
Choosing the Right Memory Module
To ensure a guaranteed-compatible, stable upgrade, confirm each of the following before you buy:
- Module type — DDR5 RDIMM for Intel Xeon Scalable and AMD EPYC servers, or DDR5 ECC UDIMM for ML30/DL20 entry servers.
- Speed grade — matched to your processor generation (for example, DDR5-4800 for 4th Gen Intel Xeon, DDR5-5600 for 5th Gen).
- Capacity — within your server's per-DIMM and total limits.
- HPE part number — validated for your specific server model.
HPE offers DDR5 Smart Memory (RDIMM) for the mainstream and EPYC servers and DDR5 Standard Memory (UDIMM) for the entry servers; the right line depends entirely on your server family. If you're unsure which module fits your configuration, see the model-specific memory page linked in the comparison table above, or contact our HPE specialists for a guaranteed-compatible recommendation.
Summary
The maximum memory configuration of an HPE ProLiant Gen11 server depends on its memory family. The mainstream Intel Xeon Scalable servers (DL320, DL360, DL380, ML350) and AMD EPYC servers (DL325, DL345, DL385) use registered DDR5 (RDIMM) and scale from 2TB to 8TB, while the entry Xeon E servers (ML30, DL20) use unbuffered ECC (UDIMM) up to 128GB. To reach full capacity, confirm whether your server takes RDIMM or UDIMM, match the DIMM speed to your CPU generation, populate every channel with the largest qualified module, and follow the population guide for your platform. Browse our full HPE Gen11 server memory selection to find guaranteed-compatible modules for your model.
