I have a feeling Andezzat might be right about the leaked versions being some sort of internal beta. Makes a lot of sense and I had the same thought at a point.
Game runs 45 - 100+ FPS (maxed out with temporal SMAA @ 1080p) on my oc'd gtx 780 (1215\7002) with oc'd 4770K (4.4Ghz). When it hits any number below 60, the GPU usage goes way down which leads me to believe that it's a driver/optimization issue.
Once the new Nvidia drivers come out, officially, and/or a patch from Ubisoft, the game will never dip below 60fps, I'm sure of it.
The dude with the 6gb gtx 780 probably downloaded a version that ha...
I have played well over 15 hours on the leaked torrent (BitCoing Mining trojan-less version!) and, I can honestly say that it really has not been downgraded as much what people are stipulating.
It actually runs pretty well on my i7 4770k + Gtx 780 (avg 60+ fps on ultra settings @ 1080p)
The story so far is really good, the game is a lot fun to play and overall the game looks amazing in my opinion.
I will still purchase a copy of the game as ...
Running it on ultra maxed out @ 1080p with no stutter issues on OC'd Asus 780 DCU II 3GB 60 FPS. It's weird how some systems stutter and others don't. We should look at other indicators to try and isolate the issue (os used, drivers, etc)