With vsync turn off (ATI 5870), there is a problem with the ati driver.
With scene where there is water fall, or water, the screen flickering with color.
Sometimes it does a black screen for less than 0.1 s, sometimes half brown screen or other strange things that look likes as big graphic card artifact. I m afraid that my hardware have a problem but it was cool.
I coudln't reproduce this bug with fraps like it seems linked to high fps (when fps go over than 100fps) and fraps reduce the fps.
If someone have an idea or report also this bug , im interested ?

Me it happens when :