thanks for the help. just wondering why in guiminer i was getting 830mh/s but in cgminer i only get 750mh/s
Are you sure you didn't update the AMD SDK? This seems to be a pretty common thing for people to do. The upgrade doesn't take effect until you reboot.
Also with caching bin files it may not take effect until you remove the pre-compiled binaries (at least that is how it works on cgminer).