I haven't noticed any microstuttering in any games either, (GRID, DIRT, CS:S, Asssasins Creed, so far...) I did notice a lag in the HL2:Lost Coast stress test where it looked like it was building up in the first few secs then flew through the test perfectly.

BTW I ran GPU-Z last night while playing GRID @ 1920x1200 with max settings and when I quit the GPU cores were all hovering around 25-30% each lol I'll grab a screen if you want. I'm just very happy with this card atm as it should last me till my next GPU upgrade!

emu