Does SSAO make a noticeable difference if you don't pay attention to whatever it exactly does?
I only ask because I had to turn it off to get smooth fps as I can only run the game on 1920x1080 due to a glitch with my RADEON HD4850
(Don't get it wrong it's a glitch I have in all games not just Shattered Horizon^^)
And yes, FRAPS is indeed a performance killer, I noticed it alot with Crysis