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HP ProDesk 400 G9 small form factor desktop, compact black chassis, front USB-C and USB-A ports, rear HDMI and DisplayPort

HP

HP ProDesk 400 G9 SFF i9-12900K 64GB DDR5 2TB NVMe Windows 11 Pro

SKU CH-GX84-TGJGM

Compact business desktop with a 16-core Intel Core i9-12900K, 64 GB DDR5, 2 TB NVMe storage and Windows 11 Pro

  • ProcessorIntel Core i9 12th Gen
  • RAM capacity64 GB DDR5
  • SSD storage2 TB PCIe
  • GraphicsIntel UHD Graphics 770
  • CPU modelIntel Core i9-12900K
  • Wi-Fi standardWi-Fi 6
  • 16-core i9-12900K reaches 5.20 GHz for demanding workloads
  • 64 GB DDR5 4800 memory handles heavy multitasking
  • 2 TB PCIe NVMe SSD stores large datasets quickly
  • WiFi 6E and Bluetooth 5.3 give fast wireless links
  • Small form factor fits tight desk spaces

Business desktop for multitasking workloads

The HP ProDesk 400 G9 SFF pairs an Intel Core i9-12900K with 64GB DDR5 4800 memory and a 2TB NVMe drive. Windows 11 Pro is pre-installed. The small form factor fits tight desk spaces while delivering 16-core processing power for office applications, data analysis and multi-monitor productivity.

Memory and storage headroom

64GB DDR5 reaches the platform maximum, so no further memory upgrades are possible. The 2TB NVMe SSD provides fast boot and application loading with room for large project files. One 3.5-inch bay remains open for a mechanical drive if additional bulk storage is required later.

Thermals and power in daily use

A 180W power supply feeds the CPU, integrated Intel UHD Graphics 770 and all onboard peripherals. The compact chassis relies on managed airflow to keep temperatures stable during sustained business workloads. Fan noise stays low in typical office scenarios, rising only under prolonged maximum turbo frequencies.

How it compares

Measured against everything we stock in Tower & Compact Desktop PCs, at today’s prices. Recalculated every night.

Price $1,615.99
Pricier than about 90% of the 14,711 comparable items (median $494.99).
RAM capacity 64 GB DDR5
Higher than about 90% of the 13,125 comparable items (median 16 GB).
SSD storage 2 TB PCIe
Higher than about 90% of the 11,342 comparable items (median 512 GB).

Specifications

Product
Brand nameHP
Product linePro series
Model name400 SFF G9
Product typeBusiness Desktops & Workstations
Recommended useRetail
Processor
ProcessorIntel Core i9 12th Gen
CPU modelIntel Core i9-12900K
Memory
RAM capacity64 GB DDR5
RAM type and speedDDR5 4800
Memory slots0
Max supported RAM64 GB
Storage
SSD storage2 TB PCIe
Hard driveNo
Graphics
GraphicsIntel UHD Graphics 770
GPU interfacePCI Express 2.0 x16
Audio & video
SoundSound card - Integrated
Audio chipIntegrated
Speaker setupInternal Speaker
Connectivity
Wi-Fi standardWi-Fi 6
Network speed10/100/1000 Mbit/s
Wired networkGigabit Ethernet
Wi-Fi802.11ax Wireless LAN
Ethernet controllerIntegrated
Bluetooth support5.3
Ports & slots
Front USB ports3x USB-A 3.2, 1x USB-C 3.2
Front audio jacks1
Video connectors1 Display Port, 1 HDMI
Rear USB ports2x USB-A 2.0, 3x USB-A 3.2
Ethernet port1 port
Power
Power supply180 W
Size & build
Form factorMini PC
Compatibility
Windows 11 supportReady
In the box
Included monitorNot included
Pointing deviceWired Mouse
Software
Operating systemWindows 11 Pro
More details
Keyboard typeWired Keyboard

Questions about this item

Will my existing 3.5" hard drive fit in the additional storage slot of this HP ProDesk 400 G9 SFF?

Yes, the chassis includes one 3.5" HDD bay so you can keep using your current mechanical drive alongside the 2 TB NVMe SSD already installed.

How can I verify the Intel Core i9-12900K is running at its full 5.20 GHz boost after setup?

Open Task Manager's Performance tab or a tool such as HWMonitor; the CPU clock should reach 5.20 GHz on the performance cores under heavy single-threaded load.

Does the box contain a monitor or only the desktop, keyboard, mouse and power cable?

The package includes the Small Form Factor desktop, a USB keyboard, a USB mouse and the power cable; a monitor is not included and must be purchased separately.

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