I just renistalled Skyrim and on all settings, Ultra/High/Medium/Low at 1080p, I am stuck at 20-30 FPS. The game is incredibly choppy and feels horrible. The only things I've done to Skyrim was install one of the popular ENB mods, but even without it it still happens. And make the common changes to the ini.
Phenom 2 x4 BE
GTX 560 TI
I just tested the arena mode in The Witcher 2 maxed out in 1080p and got 40-50 FPS with absolutely no issues at all and was as smooth as butter. So it can't be my hardware.
turn off vsync in the game.
Vsync attempts to lock you at 60fps and if it cant maintain that then it drops you to the next mulitplier of 60 which is 30, and if it cant maintain that then it drops you to the next one , you guessed it: 20.
why you cant maintain 60 on low with a 560TI beats me, updated nvidia drivers lately?
Yes go into your skyrimprefs.ini and turn off vsync, as well as the mouseacceleration. Also, try settings shadows (and only) to high instead of ultra. And run AA and AF through nVidia control panel and not in-game.
Do you have the latest patch? If The Witcher 2 works fine it must be Skyrim itself. I have a x4 945, 560ti, and 4GB myself and the game plays buttery smooth @50fps even with mods and the major 2K texture packs installed. The patches make a difference.