this motherboard can handled up to intel core 2 Duo E8600
if you put intel core 2 duo E7400 it will be fine
at least you have latest bios (0.407)
There are NO motherboards based on Intel 945 that can support 45nm quad core. There were only a rare few Intel 945 boards (out of several dozen) that could support 65nm quad core (only three intel core 2 quad Q9400,Q9550,Q9650). Nearly all 945 boards needed a VRM rework/revision just to support 45nm dual core. Due to a chipset limitation, reliably supporting quad core is not feasible and most motherboard manufacturers never bothered trying.
click this link for check your motherboard support
http://www.asus.com/Motherboards/P5GCMX1333/HelpDesk_CPU/