The supported processor list:
Socket type: 775
Motherboard supports the following processor upgrades
*Intel Core 2 Duo (Wolfsdale) E8xxx
*Core 2 Duo E6xxx (Conroe) up to E6850
* Pentium E2xxx series (Conroe) with Dual Core technology up to E2160
* Core 2 Duo E4xxx (Conroe)
* Celeron 4xx series (Conroe) up to Celeron 450
No quad core listed. Good news is that if the E8XXX Wolfdales are supported, the E5X00, E6X00, and E7X00 Wolfdales should be also.
I suspect that the power regulator on the motherboard is limited to 75 watts or so.