f4g beta bios for p35c ds3r owners is a must. this bios rocks. finally I am able to run my memories at 1200 mhz 5-5-5-18 with only +0.3 voltage. performance enhance option really works with this bios. when ı set it to extreme, the performance level is 8. and my system doesn't freeze anymore while shutting down.all my problem are gone finally....