Since I am trying to build a PC for my grandma to use, I've started looking around ebay for some cheap parts and I've found a LGA775 mobo (asrock 4core1333-fullHD) which I am going to combine with an E6850 and a 2x2gb kit of Corsair XMS2 DDR2 800MHz. The problem is, that I am not sure whether the RAM will be compatible with the mobo or not. Any help will be appreciated.