I have your answer! I had a heck of a time getting rid of this pulsing heartbeat studder for the longest time and I couldn't figure it out. It's not driver related its the SLI mode you're in.
I switched from the more modern Alternate Frame Rendering to the older Split Frame Rendering using nHancer and bingo it went away.
I'm using some slightly older beta drivers as well. 177.66 and I've only had a few hitches with the drivers in COD4 and sometimes playing windows media player but other than that I get the best performance in IL2 so far.
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