Im not a folder, but something similar happens to me when i alt-tab from games to desktop to do whatever; the card downclock, and when i get back to the game it start in slow motion, then it picks up the normal speed..
i checked and its normal, the card is just switching from idle to 2d then 3d mode..
My 5850 did this (I don't fold on it, but anyhow), it was when I came out of a long session of GTA IV and it decided to set the fan to auto as soon as it entered 2D clocks, even though 40% is set in afterburner. It's happened to me a few times before too, not often though, rather odd.
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