HP ProDesk 600 G4 Mini (DM) Upgrade Guide: RAM, SSD, CPU

Updated Oct. 8, 2026 · Written from this device's verified specifications

This guide covers memory, storage and processor upgrades for the HP ProDesk 600 G4 Desktop Mini (DM). The short version: you can fit up to 32 GB of DDR4 in two SODIMM slots, add NVMe SSDs in two M.2 slots plus a 2.5 inch SATA drive, and the processor is limited to the 8th-gen T-series chips HP lists.

At a glance

  • RAM: 2 DDR4 SODIMM slots, up to 32 GB total, unbuffered non-ECC only.
  • Storage: two M.2 2230/2280 NVMe slots plus one 2.5 inch SATA bay. A third M.2 slot is taken by the WLAN card.
  • CPU: HP lists only 8th-gen 35 W T-series chips; non-T and 9th-gen CPUs are not documented for this model.
  • HP's documents disagree on memory speed (2133, 2400 and 2666); treat 2666 MT/s as the ceiling.
SODIMM memory slot2 × DDR4 SO-DIMM · up to 32 GB total · 2666 MT/s
M.2 2230/2280 storage slot2 × SSD M.2 2230 / M.2 2280 (NVMe)
2.5" SATA drive bayHDD / SSD 2.5" (SATA)
LGA1151 CPU socket (35 W T-series)LGA1151 (8th/9th gen) · Core 8th gen
CPU · LGA1151 v22 × SO-DIMM · DDR4up to 32 GB totalM.2 2230/2280 storage slot2 × SSD M.2 2230 / M.2 2280 (NVMe)2.5" SATA drive bayHDD / SSD 2.5" (SATA)
Schematic of the upgradeable slots (not to scale). Check the owner's manual for their exact positions.

Memory (RAM): 2 SODIMM slots, up to 32 GB

The DM has two SODIMM slots, one per memory channel. They take 260-pin, 1.2 V DDR4, unbuffered and non-ECC only. The maximum is 32 GB in total. HP gives no per-module figure, but 32 GB across two slots means 16 GB per module, and HP's parts list shows 16 GB, 8 GB and 4 GB modules. There is no soldered memory, so the slots are all the memory the machine has. The system runs in single-channel, dual-channel or flex mode depending on what you install.

HP's documents disagree on speed. The service and hardware manuals mention DDR4-2133 and DDR4-2400, the parts list shows DDR4-2400 modules, and the datasheets quote DDR4-2666 (up to 2666 MT/s). The likely explanation is that 2666 is the platform maximum and depends on the processor, while 2400 is the typical shipped module. Faster modules should not be needed to get the most from this machine.

One warning from HP: modules built with x4 DRAM devices do not work, and an unsupported module can stop the system from operating properly. Modules built with x8 or x16 devices are fine.

Buying tips

  • Buy DDR4 SODIMM, unbuffered, non-ECC. Avoid ECC and registered modules.
  • DDR4-2666 or DDR4-2400 is the sensible choice; actual speed may depend on your CPU.
  • For the full 32 GB, fit two 16 GB modules. A matched pair is the simplest way to get dual-channel mode.
  • Check the module listing for x8 or x16 chips and avoid x4 designs. If the seller doesn't say, ask before buying.

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Storage: two M.2 NVMe slots plus a 2.5 inch SATA bay

Two M.2 slots are for storage and accept 2230 or 2280 length drives. HP lists NVMe PCIe Gen3 M.2 2280 SSDs. HP's documents don't say whether these slots also accept SATA M.2 drives, so stick with NVMe. A third M.2 2230 slot is reserved for the WLAN card, so leave it alone. There is also one 2.5 inch SATA bay. HP lists 2.5 inch SATA-3 SSDs (7 mm) and hard drives up to 2 TB as factory options. HP states no thickness limit for the DM, so a 7 mm drive is the safest choice. There is no 3.5 inch bay on this model.

HP's quoted maximums (SATA SSD up to 512 GB, NVMe SSD up to 512 GB, HDD up to 2 TB) are factory configurations, not hardware limits. Larger drives may well work but HP doesn't confirm it. It is also unconfirmed whether all three storage devices can be used at the same time. Some configurations include a 16 GB Intel Optane module, so what is fitted may differ from machine to machine.

Buying tips

  • For the M.2 slots, buy an NVMe SSD in 2280 (or 2230) size. Skip SATA-only M.2 drives, as support is unconfirmed.
  • For the 2.5 inch bay, choose a 7 mm SATA SSD for the best chance of fitting.
  • Larger-than-factory capacities are not confirmed by HP, so check the drive's return policy.
  • Open your machine first to see which drives and slots are already in use.

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Processor (CPU): 8th-gen T-series only

HP's documents don't name the socket. These processors are generally understood to use LGA1151 with the Q370 chipset, but verify this in HP's QuickSpecs for your model before buying. The only processors HP lists for the DM are 8th-gen T-series chips: Core i7-8700T, Core i5-8600T and i5-8500T, Core i3-8300T and i3-8100T, Pentium Gold G5500T and G5400T, and Celeron G4900T.

HP states no maximum TDP for the DM. The listed T-series chips are generally 35 W parts. The 65 W Core i7-8700 in HP's family datasheet applies to the larger SFF, MT and all-in-one models, not the DM, so don't assume a non-T chip will fit the Mini's cooling. 9th-gen processors are not documented for this model either.

Buying tips

  • Stick to the T-series chips HP lists for the DM, and check the exact model number.
  • Don't buy a non-T or 9th-gen CPU expecting it to work; HP doesn't document either for this machine.
  • Confirm the socket in HP's QuickSpecs before you order.
  • A CPU swap is the riskiest of the three upgrades. For most owners, RAM and an SSD give the most noticeable improvement.

How to upgrade

Before you start

  • Make sure you have the DM (Desktop Mini). Many HP documents cover the whole 600 G4 family, and details such as 3.5 inch bays and 65 W CPUs do not apply to the DM.
  • Back up your files, and note your Windows licence and any drive encryption recovery keys.
  • Check which modules and drives are already installed so you only buy what you need.
  • Have a small screwdriver and an anti-static strap or mat ready, and keep the HP service guide open for exact disassembly.

Steps

  1. Back up your data
    Copy important files to an external drive or cloud storage before opening the machine, especially if you plan to swap or clone a drive.
  2. Power off and unplug
    Shut the PC down fully, then unplug the power cable and any other cables and peripherals. Hold the power button for a few seconds to discharge residual power.
  3. Ground yourself
    Touch a bare metal part of the case or use an anti-static strap before handling components. Hold memory modules and drives by their edges.
  4. Open the case
    Follow the HP Maintenance and Service Guide for the correct way to remove the access panel and reach the memory, storage and processor areas. Don't force anything.
  5. Install the new part
    For memory, fit the SODIMM into the slot as shown in the manual. For storage, fit the NVMe SSD in one of the two storage M.2 slots (not the WLAN slot) or the drive into the 2.5 inch bay. For the CPU, follow the manual's procedure carefully, including the cooler.
  6. Close the case and reconnect
    Refit the access panel, reconnect the cables and power the PC on.
  7. Check that the BIOS sees the part
    Press the BIOS setup key shown at startup and check the system information for the new memory total, drive or processor. A new blank drive will also need an operating system installed or a cloned image.

Good to know

  • Many HP documents cover the whole 600 G4 family. Details such as 3.5 inch drives and 65 W processors apply to other models, not the DM.
  • HP's documents give different memory speeds (2133, 2400 and 2666). The speed you get may depend on your CPU.
  • The CPU socket and any TDP limit aren't confirmed in HP's documents. Check HP's QuickSpecs before buying a processor.
  • Whether SATA M.2 drives work, and whether all storage devices can be used at once, is unconfirmed.
  • Storage maximums quoted by HP are factory options, not proven limits.
  • Variants differ in CPU, Optane, WLAN and optional ports, so open your machine to see what's installed before buying.

Frequently asked questions

How much RAM can the HP ProDesk 600 G4 DM take?

Up to 32 GB in total, using two SODIMM slots. HP gives no per-module limit, but 32 GB across two slots means 16 GB modules.

What type of RAM does the ProDesk 600 G4 Mini use?

DDR4 SODIMM, unbuffered and non-ECC. HP warns against modules built with x4 DRAM devices. Speed is documented inconsistently (2133, 2400 and 2666), so treat 2666 MT/s as the ceiling and DDR4-2400 as a typical module.

Can I add an NVMe SSD to the ProDesk 600 G4 DM?

Yes. There are two M.2 2230/2280 storage slots, and HP lists NVMe PCIe Gen3 M.2 2280 SSDs. A third M.2 slot is for the WLAN card. HP doesn't say whether SATA M.2 drives work in the storage slots.

Can I fit a 2.5 inch drive as well as M.2 SSDs?

The DM has one 2.5 inch SATA bay, which HP lists with 7 mm SSDs and hard drives up to 2 TB. HP doesn't confirm whether all storage devices can be used at once, so check your own machine.

Can I upgrade the CPU in the ProDesk 600 G4 DM?

HP lists only 8th-gen T-series chips for this model, from the Celeron G4900T up to the Core i7-8700T. Non-T and 9th-gen processors aren't documented for the DM, and the socket isn't named in HP's documents, so confirm it in HP's QuickSpecs first.

What is the biggest SSD I can install?

HP only lists factory configurations (SATA or NVMe SSD up to 512 GB, hard drive up to 2 TB). These aren't stated hardware limits, so larger drives may work but aren't confirmed.

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.