Oh wow! It is working, I am averaging about 3.9Mh/s per card right now with my 280x's! It's slowly creeping up to 4Mh/s and may even go a little further. Not bad! I mirrored the link to your .7z so you won't have to download it with that file manager anymore: http://www.mediafire.com/download/v99de0jbr8984x4/SGMiner_14.6_mod.7z