HP ProDesk 400 G9 SFF desktop PC, Core i9-14900K, 16GB DDR5, 512GB NVMe

HP ProDesk 400 G9 SFF — compact business desktop

This small form factor desktop pairs a 24-core Intel Core i9-14900K with 16GB of DDR5 4800 memory and a 512GB NVMe SSD. It ships with Windows 11 Pro and includes a USB keyboard and mouse. The chassis fits tight workspaces while still offering one 3.5-inch drive bay for extra storage.

Sustained load behaviour with 180W power supply

The processor reaches 6.0 GHz on performance cores and 4.40 GHz on efficient cores, but the 180W unit limits how long peak frequencies hold under continuous multi-threaded work. Intel UHD Graphics 770 handles dual monitors over HDMI 1.4b and DisplayPort 1.4a without a discrete card. Memory slots are fully populated, so expansion requires module replacement up to 64GB.

Thermals, noise and power draw in normal use

The compact case and integrated graphics keep idle power low and fan noise modest during office tasks. Under heavier loads the smaller heatsink saturates faster, so fan speed rises noticeably. Gigabit Ethernet, WiFi 6E and Bluetooth 5.3 add minimal thermal load. The single PCIe 4.0 x16 slot remains available for a low-profile upgrade if the power budget allows.