HP Z2 Tower G5 Workstation upgrade guide

Updated Oct. 13, 2026 · Written from this device's verified specifications

The HP Z2 Tower G5 is a desktop workstation built around Intel's 10th Gen Comet Lake platform. All three of the things owners most often want to change — memory, storage and the processor — are socketed and replaceable. This guide tells you what fits, the limits to work within and the small details that trip people up, so you can compare parts with confidence.

At a glance

  • 4 DIMM slots take unbuffered DDR4 up to 128 GB (4 x 32 GB) at 2933 MT/s
  • Two M.2 2280 NVMe slots plus 2.5-inch/3.5-inch SATA bays; the third M.2 is WLAN-only
  • LGA1200 socket accepts 10th Gen Core and Xeon W-1200 only — not 11th Gen
  • Whatever you install, check the BIOS sees it before you close everything up
4× DDR4 UDIMM slots (288-pin), up to 128 GB4 × DDR4 DIMM · up to 128 GB total · 2933 MT/s
2× M.2 2280 NVMe + 2.5"/3.5" SATA bays2 × SSD / HDD M.2 2280 / 2.5" / 3.5" (NVMe / SATA) · up to 2.048 TB
LGA1200 socket — 10th Gen Core / Xeon W-1200LGA1200 · Core 10th gen, Xeon Scalable 1st gen · max 125 W
CPU · LGA1200max 125 W4 × DIMM · DDR4up to 128 GB total2× M.2 2280 NVMe + 2.5"/3.5"SATA bays2 × SSD / HDD M.2 2280 / 2.5" /3.5" (NVMe / SATA) · up to 2.048 TB
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.

20202021202220232024202520262027Today11 · Release · Sept. 28, 2020
Filled dots: dates published by the manufacturer. Hollow dots: estimates from third-party sources.
MilestoneDate
Release
First available to buy.		 Sept. 28, 2020 Estimate Third-party launch coverage ('Z2 Tower G5 and Z2 SFF G5 expected to hit the shelves on September 28 onwards'); HP's own QuickSpecs footnote says only 'Available in Q4, 2020' (official but less precise, and slightly inconsistent with the September date).
Source ↗

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

Memory (RAM)

The Z2 Tower G5 has four 288-pin DIMM slots and nothing is soldered, so all the memory is yours to replace. It takes desktop unbuffered (UDIMM) DDR4 only. Registered or buffered server memory will not work.

The ceiling is 128 GB, using four 32 GB modules. Modules are also sold in 4 GB, 8 GB and 16 GB sizes in non-ECC, and 8 GB, 16 GB and 32 GB in ECC.

Speed runs to 2933 MT/s. HP does sell parts labelled DDR4-3200 for this machine, but the platform runs them at 2933 MT/s, so paying extra for faster-rated RAM gains you nothing.

Error-correcting (ECC) memory is supported, but only with a Xeon W-1200 processor. It cannot be mixed with non-ECC modules — pick one type and stick with it across all four slots. The board runs in dual channel; populate both channels for the best performance.

Buying tips:

Match the modules as closely as you can — same capacity and rank — for a clean dual-channel setup.

For 128 GB you need four 32 GB dual-rank UDIMMs; there are no 64 GB modules supported.

Skip RDIMM and LRDIMM listings entirely; they do not fit this machine.

Storage

There are two M.2 2280 slots for NVMe solid-state drives. Both are PCIe Gen3 x4 (HP calls them Z Turbo Drive slots). A Gen4 NVMe drive will physically fit and work, but it will run at Gen3 speed, so there is little point paying the Gen4 premium.

There is also an M.2 2230 slot, but it is a WLAN slot (CNVi) and is not usable for storage.

For bulk storage the machine has internal 2.5-inch and 3.5-inch SATA bays, plus one external 5.25-inch slim bay that normally holds the optical drive. The exact number of internal 2.5-inch and 3.5-inch bays is not confirmed in HP's documentation — check the service manual before counting on a specific number.

On capacity, HP's own qualified lists top out at 2 TB per drive, for both the M.2 NVMe drives and the SATA SSDs and hard drives. Larger aftermarket drives are expected to work, but they are unverified here, so treat anything above 2 TB as untested territory.

Buying tips:

An NVMe M.2 2280 SSD is the single best upgrade for general responsiveness.

Buying Gen4? It will work, but at Gen3 speed — a good-value Gen3 drive is the sensible buy.

If you need more than 2 TB per drive, research compatibility carefully first; it is beyond what HP qualifies.

Processor (CPU)

The processor sits in a single LGA1200 socket and is fully replaceable. The machine is built on the Intel W480 chipset and supports 10th Gen Comet Lake Core processors — from the Core i3-10100T up to the i9-10900K — and Intel Xeon W-1200 series processors, from the W-1250 to the W-1290P. The top parts offer 10 cores and 20 threads.

One big warning: 11th Gen Rocket Lake processors are not supported. They use the same LGA1200 socket, so they will drop in physically, but the chipset and HP's firmware restrict this machine to 10th Gen parts. Don't buy an 11th Gen chip expecting it to boot.

Supported thermal design power runs up to 125 W for the K and P series parts, alongside 35 W T-series and 65 W standard chips. HP shipped these machines with different power supplies and cooling depending on the processor tier. Before buying a 125 W chip for a machine that came with a 65 W one, verify your power supply and cooler can handle it — a mismatched chassis may throttle, or the BIOS may refuse the part outright.

If you want ECC memory, you must fit a Xeon W-1200 processor.

Buying tips:

Stay within 10th Gen Core or Xeon W-1200 — nothing else will run.

Check your power supply and cooling before moving up to a 125 W K or P chip.

A Xeon W-1200 is only necessary if you need ECC.

How to upgrade

Before you start

  • Back up anything important first.
  • Shut down, switch off at the PSU if it has a switch, and unplug the power cable.
  • Ground yourself — touch the metal chassis before handling parts, and work on a non-static surface.
  • Open the case. For RAM, storage and CPU the exact disassembly varies, so follow the owner's manual for your machine's latches, screws and covers.
  • Install the part. Take care with the CPU socket — align the chip correctly and don't bend the pins.
  • Close the case, reconnect the power and start up.
  • Enter the BIOS/firmware and confirm it detects the new part before you boot into your operating system.

Steps

  1. Step 1
    Back up anything important first.
  2. Step 2
    Shut down, switch off at the PSU if it has a switch, and unplug the power cable.
  3. Step 3
    Ground yourself — touch the metal chassis before handling parts, and work on a non-static surface.
  4. Step 4
    Open the case. For RAM, storage and CPU the exact disassembly varies, so follow the owner's manual for your machine's latches, screws and covers.
  5. Step 5
    Install the part. Take care with the CPU socket — align the chip correctly and don't bend the pins.
  6. Step 6
    Close the case, reconnect the power and start up.
  7. Step 7
    Enter the BIOS/firmware and confirm it detects the new part before you boot into your operating system.

Frequently asked questions

How much RAM can the HP Z2 Tower G5 take?

128 GB in total, using four 32 GB unbuffered DDR4 modules across the four DIMM slots. There are no 64 GB modules supported.

What RAM does the HP Z2 Tower G5 use?

Desktop unbuffered DDR4 (UDIMM), 288-pin, running at up to 2933 MT/s. ECC and non-ECC modules both work, but you cannot mix them in one system, and ECC requires a Xeon W-1200 processor.

Does the HP Z2 Tower G5 support ECC memory?

Yes, but only with a Xeon W-1200 CPU. With a Core processor, use non-ECC modules. Never mix the two types.

How many SSDs can I install in the HP Z2 Tower G5?

Two M.2 2280 NVMe SSDs, plus additional SATA SSDs or hard drives in the internal 2.5-inch and 3.5-inch bays. The exact bay count is not confirmed in HP's documentation, so check the service manual. There is also an M.2 2230 slot, but it is for WLAN only.

Does the HP Z2 Tower G5 support PCIe Gen4 or 11th Gen CPUs?

No to both. The M.2 slots are PCIe Gen3, so Gen4 NVMe drives work but run at Gen3 speed. The CPU socket is LGA1200, but only 10th Gen Comet Lake and Xeon W-1200 processors are supported — not 11th Gen.

What CPUs fit the HP Z2 Tower G5?

10th Gen Intel Core (i3-10100T up to i9-10900K) and Xeon W-1200 series (W-1250 to W-1290P) on the LGA1200 socket, with a maximum supported TDP of 125 W. Verify your power supply and cooling before fitting a 125 W part.

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.