Microstuttering tests on ATI Radeon HD 4870 X2

[gosh]

100 frames taken from Crysis, Very High, 1680x1050.
One color is for 4850 CF and 2nd is for GTX280.
Both shows 40 FPS average.
Guess which one is for CF and which is for single

Is that really MS, it seems that the two lines is almost perfectly in sync, just that one of the line doesn’t flatten out or how you say it.