Im still testing my 745A576 as well though I have not found any drop in performance yet after about a month and have been pushing it past 4800 for brief periods. My test system has a killer cooling setup with seperate loops for chip and card which helps but theres more to this Im sure. Im currently at 4510mhz at 1.46v bios,CPU PLL 1.50v,FSB term 1.30v,NB 1.40v,SB 1.05v,CPU-GTL 0.57,NB-GTL 0.61,CLK overcharge 1.00v with the ram at 600 running smooth. Running Line Load Cal disabled works better with this Wolfdale then my Quad which needs it. I just ran this ten minutes ago.