The screen are from the first level, "Second Chance" just before one enters the camp.
When I first get to the spot, 90fps, run around for a minute and there is a noticeable hitch, after the hitch the fps drops off and gpu usage as well, from 99 to 60%.
First 2 shots gpu is at 99% CFX
CFX gpu usage drops off to 60%
Hopefully a proper driver/cap will fix this bug.