Kia Ora

I just the other day was doing Skuldufn on my Asus P6X58D-E with an ATI 4870 2gig version

and got a total white out so I pulled that card and put in my Nvidia 560 Ti 2win 1gig

I now get a stutter like I never seen before, the game run fine on my p8z68v with that card in it

I have put a 950 chip and 24 gig ram in the Tri channel so I figured it's the better machine to use
so here I am with the (as I thought) best machine I have and the game running worse than I every had

I need help figuring why this might be,.

Wipe the drivers from the AMD/ATI card entirely. Wipe the ones from the Nvidia card entirely. Reboot after each uninstall. Install the newest non-beta Nvidia drivers. Reboot. Wipe your INI files. Restart game.

Also, 24 GB of RAM is not helping you much with Skyrim.