Motherboard supports the following processor upgrades:
• Core 2 Duo E7xxx (Wolfdale-M)
• Core 2 Duo E4x00 (Conroe)
• Pentium E2xxx series (Conroe)
• Celeron Dual Core E1xx0 series (Conroe)
• Celeron 4xx series (Conroe)
Hp site says it doesn't support?
It doesn't look like it. That's the list HP gives for the Compaq's with that motherboard and according to them they are the CPU's that-that motherboard supports. OEM motherboars tend to be very limited in what CPU and RAM it can support.