I just purchased another 4 gig of memory for a total of 8 Gig. I am using the Extreme4, with the i2500k. The ram are GSkill Ripjaws 2133 Cas 7. I cannot get past the bios screen when all 8 gig are inserted. When everything is set in bios, it just tries multiple reboots, then goes into the bios screen. Please help!!!!!!!!!!