Re: I need help concerning low FPS whilst playing AC:B!
There could be a bug in the game, making it run really really slow.
I remember this with GTA 4, my brother got like 5 FPS and his card was able to handle the game on max settings! He downloaded a patch for it (newer version) and it worked like a charm.
So see if there is a new version for it or a fix, that could solve the problem. See if the game handles the ati card well too
Intel i7 4770k 3.50ghz, 32gb Corsair Vengeance RAM (8x4 kit), 2 x 2TB WD Black HHD, nVidia 770GTX 4gb OC, Asus Z87-A Motherboard, running Windows 7 64 bit.