I had to replace my Abit IC7G with a new one (same) and now I cannot overclock the way I used to. I was able to run my 2.4 at 3.0 or more and now cannot o/c at all without black screen. I ahve also replaced my old Geil 512 with new OCZ Gold 2x512 and my 3dmark scores have fallen by about 30%. Do I have a defective cpu or ??? I have also changed my psu to a new Antec neo 550. Any comments n why so slow now??