One more thing, (although regular readers are very much accustomed to this) we are late again with the benchmark since we waited for AMD to relase a new driver that would fix the in game performance which was, well bad. Which isn't something to be amazed about, since this is a game that was sponsored by Nvidia. On the same day when AMD released the new Catalyst 13.11 Beta 9.4 , Ubisoft has also released a patch update for the game it self, and when we ran the game with AMD cards the performance improvements were quite noticeable. We cannot say for sure which factor enabled the game to run smoothly with AMD cards, since AMD did not mention anything about a performance boost in AC 4 in their release notes.
No, what you see is a nVidia card in a poorly coded nVidia sponsored game getting 4FPS more than an AMD card. And when did 4FPS become "so much better"?
AMD FX-8350 w/ Corsair H105, ASUS Sabertooth 990FX Gen3/R2, 8GiB G.SKILL DDR3-2133, XFX HD 7970, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, Corsair C70, HP ZR2440w, Win 7 Ultimate x64