HP OMEN 25L Gaming Desktop GT15-1000 upgrade guide

Updated Oct. 19, 2026 · Written from this device's verified specifications

The OMEN 25L GT15-1000 is one of the friendlier prebuilts to upgrade: four memory slots, two free M.2 slots for NVMe SSDs and a socketed CPU. This guide covers what fits in the RAM, storage and CPU of the HP OMEN 25L Gaming Desktop GT15-1000, the limits you need to work within, and how to fit the parts safely. One thing to sort out first: two board revisions share this chassis. The GT15-0xxx models use an H670 board and shipped with a 12th Gen Intel CPU, while the GT15-1000i / GT15-1000jp models use an H770 board and shipped with a 13th Gen Intel CPU. The slot counts are identical either way, but the chipsets and the factory CPU differ, and that changes what HP will support in terms of processor upgrades. Look up your machine by its serial number on HP's support site to see the exact configuration (HP also lists the SSID there), and check the factory CPU before buying anything. A couple of other notes for planning: the power supply varies by configuration (600 W or 800 W Gold), and if you ever plan a case swap, be aware that the motherboard, front-panel wiring and RGB headers are HP-proprietary.

At a glance

  • RAM: four DDR5 UDIMM slots, up to 128 GB total, DDR5-5200
  • Storage: two M.2 2280 NVMe Gen4 slots plus one 2.5"/3.5" SATA bay
  • CPU: socketed LGA1700, 12th-14th Gen Intel, 65 W parts only
4x DDR5-5200 UDIMM, 128 GB max4 × DDR5 DIMM · up to 128 GB total · 5200 MT/s
2x M.2 2280 NVMe Gen4 + 1 SATA bay3 × SSD / HDD M.2 2280 / 2.5" / 3.5" (NVMe / SATA) · max 9.5 mm thick
LGA1700 socketed, 12th-14th Gen IntelLGA1700 · Core 12th gen, Core 13th gen, Core 14th gen
CPU · LGA17004 × DIMM · DDR5up to 128 GB total2x M.2 2280 NVMe Gen4 + 1 SATAbay3 × SSD / HDD M.2 2280 / 2.5" /3.5" (NVMe / SATA) · max 9.5 mm thick
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.

20232024202520262027Today11 · Release · April 24, 2023
Filled dots: dates published by the manufacturer. Hollow dots: estimates from third-party sources.
MilestoneDate
Release
First available to buy.		 April 24, 2023 Official HP product-spec page for the GT15-1134 configuration (P/N 7Q8Y0AA), "Release date: 24-Apr-2023"
Source ↗

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

Memory (RAM)

The GT15-1000 has four 288-pin DIMM slots, all socketed (nothing is soldered to the board). They take full-size DDR5 UDIMMs only: unbuffered, non-ECC memory in 8, 16 or 32 GB modules. That gives a maximum of 128 GB with four 32 GB sticks.

Ignore any HP support page that calls these DDR4 sockets. HP's own pages contradict themselves here - some say DDR4 while specifying DDR5-5200 modules and PC5-41600 - and the factory configuration and official spec sheet are unambiguous: this machine is DDR5. Buy DDR5-4800 or DDR5-5200 UDIMMs.

Speed tops out at DDR5-5200 with XMP modules, and you should install memory in pairs to get dual channel (two DIMMs per channel). The catch: HP warns that non-HP memory may not run at the advertised speed, because the BIOS offers limited XMP control. Third-party DDR5 will usually work but may fall back to its standard JEDEC speed of DDR5-4800 instead of 5200. Also note that DDR5-5200 is above the official supported memory spec for 12th Gen non-K CPUs, so running it is effectively overclocking the memory controller.

To use the full 128 GB you need 64-bit Windows; 32-bit Windows cannot see more than about 4 GB.

Buying tips: match DDR5 UDIMM pairs (same capacity, same kit if possible), aim for DDR5-4800 or DDR5-5200, and don't pay extra for ECC or registered memory - this board won't use it.

Buying tips

  • DDR5 UDIMM only - ignore HP's 'DDR4' typo on some pages
  • Buy in pairs for dual channel; 32 GB modules give the 128 GB maximum
  • Non-HP memory may settle at DDR5-4800 rather than 5200
  • 64-bit Windows is required to use 128 GB

Storage

There are three drive connections on the board, plus one extra slot you can't use for storage:

Two M.2 2280 Key M slots, both NVMe PCIe Gen4 x4. These are the slots you want for an SSD upgrade. Double-sided (chips on both sides) 2280 drives fit. A Gen5 SSD will work in these slots but will only run at Gen4 speed.

One M.2 2230 Key A slot. This is for the Wi-Fi/Bluetooth card only - it cannot take an SSD.

One shared 2.5"/3.5" SATA bay. It's a combo bay: you can fit a 2.5" SSD or hard drive up to 9.5 mm thick, or a 3.5" hard drive, but not both at the same time. This is the one bay the chassis provides. The motherboard's service manual shows primary and secondary SATA data connectors and two SATA power leads, so adding a second SATA drive is technically possible, but you would need to source a separate caddy/bracket and cable and route it yourself - there's no second physical bay.

HP doesn't publish a maximum drive capacity for the M.2 slots or the SATA bay, so treat any TB limit as unconfirmed and check current user reports for very large drives. There is no optical drive and no memory card reader in this chassis.

Buying tips: a 2280 NVMe Gen4 SSD is the simplest upgrade - one screw and it's done. If you want cheap bulk storage for games or media, use the SATA bay for a 2.5" SSD or 3.5" hard drive. There's no need to pay for a Gen5 drive; it won't go any faster here.

Buying tips

  • 2x M.2 2280 NVMe Gen4 x4 for fast SSDs; double-sided drives fit
  • The third M.2 slot (2230 Key A) is Wi-Fi only, not storage
  • One shared 2.5"/3.5" SATA bay - one drive at a time, 2.5" drives up to 9.5 mm
  • No documented capacity limit; Gen5 SSDs run at Gen4 speed

Processor (CPU)

The CPU is socketed LGA1700 and is replaceable, and the socket covers 12th, 13th and 14th Gen Intel Core processors. Which chips HP actually supports depends on which board revision you have.

GT15-1000i models (H770 board, shipped with a 13th Gen CPU, SSID 8B1D) have a documented upgrade path: HP supports moving from 13th to 14th Gen, but only with BIOS F.20 or later installed first. Update the BIOS before you swap the chip.

GT15-0xxx models (H670 board, shipped with a 12th Gen CPU) are less clear: HP has not published upgrade support for them, so don't assume a newer generation will work - check HP's processor upgrade page for your exact SSID before buying.

Whichever board you have, stay with 65 W F-series parts. HP only offers 65 W processors in this machine and the cooler is sized for them. 125 W K-series chips are not supported, and the BIOS gives you no CPU overclocking anyway. If you want the extra cores of a 14th Gen chip, pick a 65 W F-series model from HP's upgrade list.

Also check your power supply before a big upgrade round: it's 600 W or 800 W Gold depending on configuration.

Buying tips: identify your factory CPU first (the digits after the hyphen show the generation, e.g. i7-13700F is 13th Gen), confirm your SSID, install the required BIOS update, and only then order the chip. Keep the old CPU until the new one boots.

Buying tips

  • Socketed LGA1700, 12th-14th Gen Intel Core
  • 13th to 14th Gen is documented for GT15-1000i only, with BIOS F.20+ (SSID 8B1D)
  • 65 W F-series only - 125 W K-series chips are not supported
  • HP has not published upgrade support for the 12th Gen GT15-0xxx boards

How to upgrade

Before you start

  • Look up your serial number on HP's support site and note the exact configuration, factory CPU and SSID.
  • For a CPU upgrade, check HP's upgrade list for your SSID and install the required BIOS update first (F.20 or later for 14th Gen on GT15-1000i).
  • Buy memory in pairs and check your case clearance and cooler before ordering a new CPU.

Steps

  1. A safe, general upgrade outline
    1. Back up anything important before you touch the hardware. 2. Shut down the PC properly, switch the power supply off and unplug the mains cable (and any other cables). 3. Ground yourself - touch the metal chassis or use an anti-static strap - and work on a hard, non-carpeted surface. 4. Open the case. HP uses specific panels and latches, so follow the disassembly instructions in the owner's/service manual for your exact model rather than guessing. 5. Install the part: seat RAM modules firmly in pairs, screw M.2 drives into place, or swap the CPU in the socket without touching the pins. Don't force anything. 6. Close the case, reconnect the cables and switch the power supply back on. 7. Boot and enter the BIOS/firmware setup to confirm the new RAM, drive or CPU is detected at the expected size and speed, then let the operating system recognise it too.

Good to know

  • Two board revisions (GT15-0xxx H670 / GT15-1000i H770) share this chassis; verify your variant by serial number before buying upgrades.
  • HP's manuals show two SATA data connectors, but the 25L chassis provides only one physical drive bay.
  • HP publishes no maximum storage capacity and no explicit CPU TDP limit; only 65 W F-series processors are offered.

Frequently asked questions

How much RAM can the HP OMEN 25L GT15-1000 take?

Up to 128 GB, using four 32 GB DDR5 UDIMMs across the four DIMM slots. Use 64-bit Windows to see the full amount.

Does the OMEN 25L GT15-1000 use DDR4 or DDR5?

DDR5 only, in 288-pin UDIMM form. Some HP support pages say DDR4, but that's a known documentation error - the factory modules and spec sheet both say DDR5-5200.

How many SSDs can I install?

Two M.2 2280 NVMe Gen4 SSDs in the storage slots, plus one SATA drive in the shared 2.5"/3.5" bay. The third M.2 slot is for the Wi-Fi card only.

Can I upgrade the CPU to a 14th Gen Intel processor?

Only on the GT15-1000i (H770, SSID 8B1D) boards, and only after updating to BIOS F.20 or later. For the 12th Gen GT15-0xxx boards, HP hasn't published upgrade support.

Can I install a K-series (overclockable) CPU?

No. HP supports 65 W F-series parts only, the cooling is sized for them, and the BIOS offers no CPU overclocking.

Will a Gen5 SSD work in this PC?

Yes, but the M.2 slots are PCIe Gen4 x4, so a Gen5 drive will run at Gen4 speed. A Gen4 drive is the sensible buy.

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.