It's not Fraps- and probably not the computer- it's the games. I get the same FPS drops in some games. If your drivers are up to date and your games are patched I wouldn't blame your Asus, I would blame the games. Skyrim is one of those that runs at 60 for me until I look at a torch then I get about 2 FPS. Portal 2, however, runs at a a capped 60 FPS and never hangs, drops, or changes at all according to Fraps.
List the games specifically that do this, and especially when. If the answer is "Crysis when I aim down the sights and shoot" or "Skyrim in dungeons when I look at fire" then close the book, those games are broken.