i7-4770, i7-4790 (compatibility with 4790 may require a BIOS update). i5-4570, i5-4590, i5-4670. i3-4130, i3-4330. HP Support Community Expansion & Connectivity
This motherboard uses the . It supports Intel "Haswell" processors. If you are looking to upgrade the CPU, these are the compatible lines:
If you want to max out this motherboard today, here is the peak hardware it can handle: HP 18E7 motherboard not working after Cpu swap