[AngryMerchant]

If the physics run on the CPU, how is that related to the weakness of the GPU?

For example, in Saints Row The Third I might have an airstrike that blows up 5 cars, no problem. But at another time, one car gets blown up by a grenade, 10 fps. Assassin's Creed II seems to just do it at random. It is not a natural frame rate drop from demanding situations, I already explained it does not happen in Borderlands or Serious Sam 3, both moderately demanding games. It is an inexplicable issue that consistently drops the framerate to 10-15 fps regardless of how much or how little is happening. I get the feeling I'm going to have to repeat this a lot.

It's been having this issue since I got it. I doubt it's a dust issue.