British bob what are you referring to?
Unless I am mislead, textures do not have a very large, if any, impact on fps when your card has enough vram right? Unless you have an enb on or ini edits most of your mods will make no difference in performance. However the 5 fps difference may very well be due to your mods as 5 fps is not much either.
EDIT: Btw, this benchmark shows that statement about most 300 plus dollar cards being almost the same is true for vanilla skyrim. But I question if they would all perform so equally with K ENB and a grass mod like unreal has... http://kotaku.com/5961994/what-skyrim-looks-like-when-youre-running-100-mods-at-onceEdited by mike88931 - 4/14/13 at 12:10pm