I too have a Biostar A77OE3 I am running 16 Gigs of ram in it. They all show up cuz I have a 64 bit OS. However, I have a quad core processor and only 3 are working. I went into the bios and attempted to activate the 4th and it doesn't do it. Do I need to update my bios? Or do I need ot get a different Motherboard?