Yeah you won't much benefit from skyboost if you can already run skyrim at 40+ fps, those running at 10, 20, 30 fps can receive amazing performance boosts.
With your machine you will only see noticeable improvements (at least a +5 fps increase) in extremely heavy cpu areas, lots of shadows, falling leaves, smoke are the situations you'll get a bump.
The new version will include gpu optimizations as well so you may get more mileage out of it (fog, magic effects, fire and possibly even post processing, SSAO, and AA will take much less gpu power).