Small Form Factor (SFF) or proprietary modified ATX.
Because this board utilizes the older Intel Q67 Express enterprise chipset, its CPU support is locked structurally and via BIOS to specific Intel generation architectures: HP motherboard E93839 FXN1 With Intel I5-6500 | eBay
Supports up to 1333 MHz or 1600 MHz depending on the specific CPU used. Expansion Slots: 1 x PCI Express x16 (for graphics). 1 x PCI Express x1. Up to 2 x Legacy PCI slots (on CMT versions). hp fxn1 e93839 motherboard specs 2021
The front panel headers and mounting holes don't align with standard aftermarket PC cases. No NVMe Support:
generation processors, the FXN1 motherboard remains functional for basic tasks, browsing, and media consumption. Small Form Factor (SFF) or proprietary modified ATX
If you are buying this board to build a custom PC, be aware that HP uses proprietary fan headers
You cannot use a standard retail power supply (like Corsair or EVGA) with this board without an expensive adapter (HP 6-pin to 24-pin). Conversely, the HP 240W PSU (PN: 700818-001) will not power standard motherboards. 1 x PCI Express x1
There are later iterations listed under the same "E93839" label that support newer hardware, which can cause confusion:
Designed for business efficiency, the board includes multiple standard ports.
This motherboard was a staple in HP's 2021 desktop lineup, specifically designed for business and enterprise environments.