HPE ProLiant MicroServer Gen11 Upgrade Guide: RAM and Storage

Updated Oct. 9, 2026 · Written from this device's verified specifications

This guide covers memory and storage upgrades for the HPE ProLiant MicroServer Gen11. The short answer: it takes up to 128 GB of DDR5 ECC unbuffered memory in four slots, four SATA drives in non-hot-plug bays, and one M.2 drive if you add an optional kit. We can't confirm a processor upgrade path.

At a glance

  • RAM: 4 DDR5 ECC UDIMM slots, 16 GB or 32 GB modules, up to 128 GB total, running at up to 4400 MT/s.
  • Non-ECC DDR5, RDIMMs and LRDIMMs do not work.
  • Storage: four non-hot-plug SATA bays for 3.5 inch HDDs, with 2.5 inch SSDs also listed by HPE.
  • The single internal M.2 slot only works with the optional iLO/M.2/serial port kit.
  • HPE lists several processor options (Xeon 6300, Xeon E-2400, Pentium), but we can't confirm that the CPU is user-replaceable.
DIMM slot (DDR5 ECC UDIMM)4 × DDR5 DIMM · up to 128 GB total · 4400 MT/s · ECC
Drive bay (non-hot-plug, LFF)4 × HDD / SSD 3.5" / 2.5" (SATA)
4 × DIMM · DDR5up to 128 GB totalDrive bay (non-hot-plug, LFF)4 × HDD / SSD 3.5" / 2.5" (SATA)
Schematic of the upgradeable slots (not to scale). Check the owner's manual for their exact positions.

Lifecycle and support

A current model: sold new and supported.

2024202520262027Today11 · Release · June 3, 202422 · EOL · Oct. 31, 2026
Filled dots: dates published by the manufacturer. Hollow dots: estimates from third-party sources.
MilestoneDate
Release
First available to buy.		 June 3, 2024 Estimate Date of QuickSpecs Version 1 ('New QuickSpecs'), HPE's first published documentation; not a confirmed ship date.
Source ↗
End of life (EOL)
The manufacturer stops developing the product: no new BIOS, firmware or driver releases.		 Oct. 31, 2026 Estimate Reseller SHI states 'the manufacturer's estimated end of life date for this product is 10/31/26'; unclear whether this means end of sale. HPE has not published it.
Source ↗

Dates not listed haven't been published by the manufacturer or a reliable third party.

RAM: DDR5 ECC unbuffered DIMMs, up to 128 GB

The MicroServer Gen11 has four full-size DIMM slots, arranged as two channels with two DIMMs per channel. It uses DDR5 ECC unbuffered DIMMs (UDIMMs), not laptop SO-DIMMs. HPE lists 16 GB single-rank and 32 GB dual-rank modules. Four 32 GB modules give the 128 GB maximum, and four 16 GB modules give 64 GB. None of the slots is soldered, so all four can be filled by the owner.

Only ECC UDIMMs work. Ordinary consumer non-ECC DDR5, registered DIMMs (RDIMMs) and load-reduced DIMMs (LRDIMMs) are not supported. Use HPE-qualified modules, fill the slots in the order A, B, C, D, and avoid mixing capacities.

Memory speed tops out at 4400 MT/s, and the actual speed depends on the memory type, how many modules you fit and the installed processor. HPE's documents are inconsistent here: the QuickSpecs table shows a 5600 MT/s native speed, and HPE's own kits are described as DDR5-4800. The server still runs them at no more than 4400 MT/s, so don't expect 4800 or 5600.

Buying tips

  • Buy DDR5 ECC unbuffered (UDIMM) modules only, and check the label says ECC and unbuffered.
  • Choose 16 GB or 32 GB modules; these are the sizes HPE lists.
  • Buy matching modules rather than mixing capacities.
  • Check which processor your unit has, since it affects the memory speed you get.

Storage: four SATA bays and an optional M.2 slot

The chassis has four non-hot-plug drive bays (positions 1 to 4), so power the server off before swapping a drive. They take SATA HDDs or SATA SSDs, connected through the VROC SR controller. The chassis is a large-form-factor (3.5 inch) design. HPE also lists 2.5 inch SSDs, probably via adapters or caddies, but we couldn't confirm how they mount or whether there is a thickness limit.

HPE's listed maximums are 16 TB (4 x 4 TB 3.5 inch HDDs) or 3.84 TB (4 x 960 GB 2.5 inch SSDs). HPE says the maximum follows its current option list, so larger SATA drives may work, but they aren't officially listed. Treat anything bigger as untested.

There is also one internal M.2 slot, but it is only available with the optional iLO/M.2/serial port kit. HPE's documents name that kit differently, and one of them gives the part number as P65741-B21, so verify the exact part number before ordering. The M.2 drive HPE lists is the 480 GB NVMe Gen4 PM9A3 (P69543-B21), a low-power NVMe drive. The M.2 length (2280 or 2242) and the PCIe generation and lanes of the slot aren't stated in the documents we found. Check HPE's maintenance or user guide before buying a different M.2 drive. Another HPE page lists iLO 6 under standard system management, so check what your configuration already includes.

Buying tips

  • Stick to SATA drives for the four bays.
  • For 2.5 inch SSDs, confirm how they will mount in the 3.5 inch bays before buying.
  • Don't buy an M.2 drive until you've confirmed the kit and the slot's supported length in HPE's guide.
  • If in doubt, pick a drive HPE lists, because larger sizes are untested.

Cheapest compatible right now

See all compatible parts and prices →

How to upgrade

Before you start

  • Back up any data on the server, especially before changing drives.
  • Download the HPE user guide and maintenance guide for exact disassembly steps.
  • Check which processor your unit has, as it affects memory speed.
  • Make sure the new parts are the right type: DDR5 ECC UDIMM for memory, SATA for the bays.
  • Have a clean, static-safe work surface and a grounding strap if you own one.

Steps

  1. Back up your data
    Copy anything important off the server. Note any RAID settings before you change drives.
  2. Power off and unplug
    Shut the server down fully, then remove the power cable and all other cables. The drive bays are not hot-plug.
  3. Ground yourself
    Touch bare metal on the chassis or use an anti-static strap before handling parts, and hold memory and drives by their edges.
  4. Open the case
    Follow the owner's manual or maintenance guide for the exact way to open the chassis and reach the memory slots and drive bays.
  5. Install the part
    For memory, follow HPE's DIMM installation procedure and fill the slots in the order A, B, C, D. For drives, fit them in the bays (using adapters for 2.5 inch drives if needed). For an M.2 drive, first make sure the optional iLO/M.2/serial port kit is installed.
  6. Close up and reconnect
    Refit the cover, reconnect the cables and power the server on.
  7. Check that it's detected
    Look in the BIOS or firmware setup to confirm that the full memory capacity and the new drive are listed. If something is missing, power off, unplug and re-check the seating and compatibility.

Good to know

  • HPE's documents disagree on memory speed: the QuickSpecs table shows 5600 MT/s, HPE's kits are described as DDR5-4800, and the server runs at no more than 4400 MT/s.
  • The M.2 slot needs the optional iLO/M.2/serial port kit. HPE names the kit differently across documents, so verify the part number before ordering.
  • The M.2 length, the PCIe generation and lanes, and any 2.5 inch drive thickness limit aren't stated in the documents we found.
  • Drives larger than HPE's listed 4 TB (3.5 inch) and 960 GB (2.5 inch) options may work but are not officially listed.
  • We can't confirm whether the processor can be replaced by the owner, so there is no CPU upgrade section.
  • Always use the HPE owner's manual for exact disassembly steps.

Frequently asked questions

How much RAM can the HPE ProLiant MicroServer Gen11 take?

Up to 128 GB, using four 32 GB DDR5 ECC unbuffered DIMMs. With 16 GB modules the maximum is 64 GB.

Does the MicroServer Gen11 support non-ECC or consumer DDR5?

No. Only ECC unbuffered DIMMs are supported. Non-ECC UDIMMs, RDIMMs and LRDIMMs do not work.

What memory speed will I get?

Up to 4400 MT/s, depending on the memory type, how many modules you fit and the processor. HPE's documents mention 4800 and 5600 MT/s figures for the modules themselves, but the server runs at no more than 4400 MT/s.

Can I use bigger drives than HPE lists?

HPE lists 4 TB 3.5 inch HDDs and 960 GB 2.5 inch SSDs, but says the maximum follows its current option list. Larger SATA drives may work, but they aren't officially listed.

Does the MicroServer Gen11 have an M.2 slot?

Yes, one internal M.2 slot, but only with the optional iLO/M.2/serial port kit. HPE lists a 480 GB NVMe Gen4 PM9A3 drive for it. The supported M.2 length isn't stated in the documents we found.

Can I upgrade the CPU?

HPE lists Xeon 6300-series, Xeon E-2400 and Pentium processors for this server, but the documents we found don't say whether you can swap the processor yourself. Check HPE's maintenance guide before buying one.

Official documents and references

This guide was written with AI assistance from the compatibility data PartsPrices verified against the manufacturer's documents. Always check your exact model and the owner's manual before buying or opening your computer.