BatteForte

But I only get 15-20FPS. I have a lot of 4k/8k textures mods installed, does VRAM not make a difference here? 4k/8k textures are useful only when you have a 4k/8k monitor. Besides, 4k monitor‘s resolution ration is 4096*2160, I can barely see the icon on Windows.

Maybe you attacked one of the guards the moment the dragon was killed. And try this command in console: paycrimegold 0 0 000267EA

For skyrim, GTX680 would be enough. Maybe you should turn down some effects like SSAO. And to be honest, the largest difference between 680 and 980 is their power consumption.