That is interesting that you can no longer see it with AA and AF enabled. The blinky test did not reveal any flickering on the board I have. But to answer your question, yes, I did test at least 3 different resolutions with AA and AF enabled. I always used 8xAF setting when testing with AA enabled.
1600x1200 is a killer with 4xAA or higher settings to the point most newer graphically demanding games are not playable to me (less than 30fps average). Even 2xAA enabled generally gave a 50%+ hit in FPS but games such as UT2K3 were still very playable and in fact ran smooth.
Yes, it is a complete test in that I tested three seperate screen resolutions with No AA, 4xAA, 8xAA. Where enabling AA I used 8xAF.