HP ProDesk 600 G5 Small Form Factor PC upgrade guide

Lifecycle and support

A current model: sold new and supported.

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

RAM (memory)

The ProDesk 600 G5 SFF has four 288-pin DDR4 DIMM slots - full-size desktop modules, not the small SO-DIMMs used in laptops or the Desktop Mini. There is no soldered memory, so all of your RAM lives in these slots and you can replace whatever the machine shipped with.

What fits: unbuffered, non-ECC DDR4 UDIMMs at up to DDR4-2666 (PC4-21300), 1.2 V. Server memory - ECC, registered or buffered DDR4 - will not work. The maximum per module is 32 GB, giving 128 GB total across four slots.

A note on the maximum: HP's US data sheet and Kingston both confirm 128 GB (4 x 32 GB), while HP's Japanese CTO sheet still lists 64 GB (4 x 16 GB). That lower figure is most likely an earlier limit written before 32 GB desktop modules were common - 128 GB is the figure to work with, and 64 GB is simply what HP originally sold.

Two speed caveats. The platform is rated for DDR4-2666, but your actual memory clock follows the CPU: 9th-Gen Core i5/i7/i9 chips run memory at 2666 MT/s, while the i3, Pentium and Celeron parts run it at DDR4-2400. Faster modules simply clock down, so don't pay a premium for high-speed RAM your CPU can't use. And install modules in matching pairs in the correct channels to get dual-channel performance - a single stick runs in single-channel mode.

Buying tips:
- Buy low-profile DDR4 UDIMMs without tall heat spreaders - the SFF lid needs clearance and high modules can stop the case from closing.
- Standard JEDEC-spec modules from the usual brands work in practice; HP's service guides prefer HP-branded or qualified memory, so check a compatibility list if rock-solid stability matters to you.
- Mixed kits: use matched modules (same size and speed) for the smoothest dual-channel operation.

Buying tips

• Non-ECC, unbuffered (UDIMM) DDR4 only
• Low-profile modules so the SFF lid closes
• Buy in matched pairs and mind the CPU's memory speed limit

Storage (SSD and hard drive)

There are two real storage upgrade paths here: an M.2 NVMe slot and an internal SATA bay.

M.2 NVMe slot. The Key M slot takes M.2 2230 or 2280 drives wired for PCIe 3.0 x4 NVMe. HP shipped drives from 128 GB up to 1 TB, and 1 TB is the validated maximum - larger NVMe drives usually work, but they are outside HP's tested list. A word of warning about M.2 SATA drives: HP does not offer them for this machine and they are often not wired or supported on these business desktops, so verify with your specific SKU before buying one. Also don't confuse slots - the separate small Key E 2230 slot holds only the wireless card and is not a storage slot at all.

Internal SATA bay. The standard configuration has one internal bay that accepts either a 2.5" SSD or a 3.5" hard drive on SATA-3 (6 Gb/s). HP validated drives up to 2 TB; bigger SATA drives usually work too, but chassis clearance is the real limit for 3.5" models. The service guide's parts list also mentions an optional second 3.5" hard drive in some configurations, while HP's Japanese CTO sheet lists just the one internal bay - so if you want two hard drives, check your SKU's drive cage and cabling first. There is also a separate 9.5 mm slimline optical bay (DVD or Blu-ray writer) that you can leave as-is or, if you're creative, repurpose - though HP documents it as an optical drive bay.

One more thing: Intel Optane caching, where offered, accelerates SATA drives only - HP's own technical notes say it is not supported for NVMe drives, so it's no help if you're going all-NVMe.

Buying tips:
- For the biggest everyday speed boost, put your OS on an NVMe drive in the M.2 slot.
- Pick a 2280 NVMe drive unless you specifically need the short 2230 format.
- For mass storage, a 3.5" SATA HDD gives you the most capacity; a 2.5" SATA SSD is the quiet, fast option.
- Want two hard drives? Confirm your unit has the second drive cage and cables before ordering.

Buying tips

• M.2: NVMe PCIe 3.0 x4, 2230 or 2280 - HP validated up to 1 TB
• SATA bay: 2.5" or 3.5", up to 2 TB validated
• Check drive cage and cables if you want a second SATA drive

CPU (processor)

The processor is socketed and upgradable. The socket is LGA1151 (Coffee Lake) on Intel's Q370 chipset, and the supported families are 8th-Gen (Coffee Lake) and 9th-Gen (Coffee Lake Refresh) Core i3/i5/i7/i9, plus Pentium Gold and Celeron chips.

The hard limits to know: the board supports CPUs up to 65 W TDP, so the 95 W and 125 W 'K' overclocking chips are out. 10th-Gen and newer processors do not work - they use a different socket. On the odd-but-important side, the i5-9500F has no integrated graphics, so going that route means adding a discrete graphics card too.

One timing note: systems that shipped with an 8th-Gen CPU may need a BIOS update before they'll accept a 9th-Gen chip. If you're moving up a generation, update the BIOS with your old CPU still installed first. Check HP's support pages for your exact SKU or serial number - configurations like 7PJ81EA were built to order, so the shipped CPU, memory and storage vary from unit to unit.

Buying tips:
- Shop for 65 W or lower 8th/9th-Gen Core chips; skip anything with a 'K' or a TDP above 65 W.
- Update the BIOS before swapping in a 9th-Gen CPU if your machine came with an 8th-Gen one.
- A used 9th-Gen Core i7 or i9 is the natural top-end upgrade for this board.

Buying tips

• 65 W TDP maximum - no K-series chips
• 8th- and 9th-Gen only; 10th-Gen needs a different socket
• Update the BIOS first if the machine shipped with an 8th-Gen CPU

How to upgrade

Before you start

• Back up anything you care about before opening the case.
• Shut down the PC, switch off the power and unplug the mains cable (and any other cables).
• Ground yourself - touch the metal chassis or use an anti-static wrist strap - and handle parts by their edges.
• Open the case and install the new part. For the exact release latches, screws and disassembly order for this chassis, follow HP's Maintenance and Service Guide for the ProDesk 600 G5 SFF; the details differ between HP models, and this guide doesn't invent them.
• Close the case, reconnect the cables and power on.
• Enter the BIOS/firmware setup and confirm it detects the new memory, drive or CPU - and check the total RAM and boot drive are what you expect.

Steps

1. Installing RAM
   Back up, power off and unplug, ground yourself, then open the case. Open the memory slot latches, align the notch on the module with the slot key and press it down firmly until the latches click. Use matched pairs in the correct channels. Close the case and check in the BIOS that the new total is recognised.
2. Installing an M.2 NVMe SSD
   Back up, power off and unplug, ground yourself, then open the case. Locate the Key M storage slot (not the small Key E slot for the wireless card), insert the 2230 or 2280 drive at a slight angle and secure it with its mounting screw. Close the case, then confirm in the BIOS that the drive appears.
3. Installing a SATA drive
   Back up, power off and unplug, ground yourself, then open the case. Mount the 2.5" or 3.5" drive in the internal bay and connect the SATA data and power cables. If you're after a second hard drive, first confirm your unit actually has the second cage and cables. Close the case and check the BIOS sees the drive.
4. Installing a CPU
   Back up, power off and unplug, ground yourself. If you're moving to a 9th-Gen chip on a machine that shipped with an 8th-Gen one, update the BIOS first, with the old CPU still fitted. Then open the case, release the socket lever, lift the retention bracket, swap the processor - matching the socket orientation - and close the bracket and lever. Refit the cooler. Close the case and verify the new CPU in the BIOS. See HP's Maintenance and Service Guide for the exact socket procedure.

Good to know

• This page covers the SFF chassis only - the ProDesk 600 G5 Desktop Mini and MT are different machines with different limits.
• Maximum capacities are the values HP validated; larger aftermarket drives and modules often work but are outside HP's tested list.

Frequently asked questions

How much RAM can the HP ProDesk 600 G5 SFF take?

Up to 128 GB, as 4 x 32 GB non-ECC DDR4 UDIMMs in its four DIMM slots. HP's US data sheet and Kingston confirm 128 GB; an older HP Japanese spec sheet still lists 64 GB, which was most likely the original validated limit before 32 GB modules were common.

What RAM does the ProDesk 600 G5 SFF use?

Full-size 288-pin desktop DDR4 UDIMMs, non-ECC and unbuffered, up to DDR4-2666. ECC and registered server memory is not supported, and you should use low-profile modules so the small form factor lid closes.

Does it support 9th-Gen or 10th-Gen Intel CPUs?

It supports 8th- and 9th-Gen Core i3/i5/i7/i9, Pentium Gold and Celeron chips on LGA1151, up to 65 W TDP. 10th-Gen and newer processors are not supported - they use a different socket. Systems that shipped with an 8th-Gen CPU may need a BIOS update before taking a 9th-Gen chip.

Can I install an M.2 SATA SSD?

It's uncertain. HP only offers PCIe NVMe M.2 drives for this machine, and M.2 SATA modules are often not wired or supported on HP business desktops. Verify with your exact SKU before buying one - the safe choice is an NVMe drive in the M.2 2230/2280 slot.

How many storage drives can it hold?

In the standard configuration: one M.2 NVMe SSD plus one internal 2.5"/3.5" SATA drive. The service guide's parts list also shows an optional second 3.5" hard drive in some configurations, so check your unit's drive cage and cables if you want two SATA drives.

Is the ProDesk 600 G5 Desktop Mini the same machine?

No. The Desktop Mini variant shares the model name but has just 2 SO-DIMM slots (32 GB max) and different storage hardware. This guide is for the SFF chassis only.

Official documents and references

• PDF HP ProDesk 600 G5 Small Form Factor PC Maintenance and Service Guide
  Official HP service guide - disassembly, parts lists and supported configurations
• PDF HP ProDesk 600 G5 SFF data sheet (US)
  Confirms 128 GB maximum memory and the socketed CPU platform
• PDF HP ProDesk 600 G5 SFF technical data sheet
  Storage options and the note that Optane caching does not apply to NVMe drives
• PDF HP ProDesk 600 G5 SFF CTO/BTO specification sheet (Japanese)
  HP's original configuration limits, including the earlier 64 GB memory figure
• Kingston memory compatibility list for the ProDesk 600 G5 SFF
  Validated memory modules and CPU-dependent memory speeds