Well long story short, I have a dell 9400 that has a 7800 go and the vid card always OC'ed well without any problems. I recently reinstalled windows and wiped it clean. Now, the video card refuses to OC ive tried using riva tuner and ntune, both with no avail. I used to use the coolbits hack, but now that doesnt work with the new drivers. Any thoughts or advice?