well, put some little pipe stuff ont he video card and see if it works better. lol

, jk.
What settings are you running your card at when you play your games? And is it a flicker like you said, or is it more of a studder? A flicker would be something like your monitor turns off, then back on. A studder would be where you always have an image, but it kinda pauses for a split second or so. Big difference.