XPS 700 Processor Upgrade

Hello all, I've been trying to find out what processors are compatible with my XPS 700 with mixed results.  I bought the unit used and previous owner never did the free upgrade to the 720 motherboard so I know quad cores are out :emotion-6:   What I'm trying to figure out is if the E8400 Wolfsdale will work in my system, I believe it should since it's LGA 775 but I've heard from a few people that the original XPS 700 motherboard may not be able to handle the new 45nm process chips.  Is anyone running this chip on an XPS 700 without the motherboard upgrade or does anyone know for sure if this chip is compatible?  If not what am I restricted to for choices?

Thanks in advance for the help :emotion-1: