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But i guess having it off all the time is a bad thing ?
I don't think so, happens on clean installs, and I swapped my GTX280, which was fine, directly for a 5770 and I experienced the problem as soon as I started using the ATI card. It's something to do with the patches of GTA and catalyst drivers, as it hasn't always been a problem for a lot of people. There may be some hardware configs it's affecting and others it's not, but I have no doubt the problem is in a patch/catalyst.
if res 5 is anything to go by then having it off does lower image iq slightly.if you look closely you might see that edges are a bit fuzzy even when you use AA.
advanced can also sometimes lower iq but ive never took the time to study it so as a rule of thumb standard is the best option 24/7 UNLESS you run into problems like GTAIV.
still sucks tho doubtful it will be patched either