I have an Iwill P4R533 with a 2.0 P4. I had it overclocked to 2.6 for a day. I thought my power supply had died so I got a Antec 550. But, as soon as I put that in, my Nvidia 4600 fried. Now I can't get past 2.4. I have backed the memory down to 3x and my last video cards AGP down to 1x but, it still loses video after 2.44. It doesn't matter what my vcore is set at. What is the deal????? I had Mandrake 8.1 installed when I got to 2.6. Thats the only thing different. Everthing is water cooled, cpu temps never go past 38*c and system temp never goes past 32*c.