start with the simple stuff first. make sure your mb chipset drivers are up to date and the amd video card drivers are the newest ones. make sure your not missing any drivers for the mb. also make sure your sound chipset drivers are updated. make sure your dvix or codex pack is up to date. check to see what codexs fraps can use to compress or use when it makes avi video clips of your games.
Fraps can be a very high resource application. I don't think it would be your graphics card completely. I would look and see if you can find another capture program that doesn't record in a non compressed format. Maybe something like bandicam I've heard that is less taxing on your system. Also there is a good chance fraps doesn't take full advantage of 8 cores whether its bulldozer or piledriver (love the nicknames they both get )