Try this: Download GPU-Z, run it, check the sensors tab, scroll down to vram, run the game for a bit, quit the game, check what was the max value it reached or if it peaked consistently. If it did... I would recommend you optimize your textures as you probably are running out of vram. With 1gb.... I would recommend you use 1024 textures max for optimal performance if you have installed all the landscape/town/clothing high res packs. MAKE A BACKUP OF YOUR SKYRIM FIRST. You can run the following program with these settings: Optimizer Textures by AdPipino http://i45.tinypic.com/23sumn7.jpg In the BSA section of the program you can select BSA files to try and optimize as well, this isnt necessarily the best idea and might give you problems, but you CAN do this as well if you have large mods installed that also come with high res textures (for example I have a 1.4gb armor pack which I optimized, but the 200mb armor pack I optimized had my game crash, so I had to manually restore the backed up bsa file)