i5 3570k (not over clocked)
8gb ram
gtx 780ti (not over clocked)
Settings on max everything
Nearly died at the first part of the benchmark, it started off looking like early GTA: San Andreas on pc (or extremely low graphic settings on GTA IV trying to paint an accurate picture). Once it kicked in the game looked glorious (I have everything maxed out 3154mb used according to the settings screen). I'm actually going to turn off Tessalation and Ambient Occulation I have a bad track record with them turned on in pc games (eg: Arkham Asylum and Tomb Raider) ends up giving me motion sickness and really bloodshot eyes. I can live without the extra "sexyness" of the graphics. I'm satisfied with the extreme bump up in fps compared to the 360 version (the low fps made driving really tedious).
I'm going to have to run a frame rate limiter as well, the combination of my video card, power supply and motherboard gives out a coil whine when games have an excessively large FPS rating (thus I use RTSS to limit the FPS in most games to 50-60fps).
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All was well, I think playing with the settings in the game can make it screw up in a way, I adjusted a few things and went back to the game play and it wouldn't stop stuttering :-/. I thought it was MSAA related (once I turned it off, the stutter was gone), but it came back and gradually got worse to the point where my game was moving at what felt like 1FPS.
Really annoying, wish I knew what the solution was haha.