Just an update, I've been monitoring my VRAM usage during gameplay as well to check if that was the issue. It seems that my memory usage for skyrim only goes up to 350~380MB before my fps drops. Considering I have 2GB VRAM, I don't think that would be the issue there. Also, I've tested this several times and every time my fps has dropped consistently at about two minutes of game time. I've tested several areas, interiors, exteriors, even the character creation screen, all of which display the same behavior.