I've been having a rather odd issue with mining feathercoin... I have dual 7950s and they get ~550Khash/sec, however I've noticed that sometimes one gpu will have over 2x the accepted shares compared to the other gpu(same amount of stalls).  Has anyone else noticed this?  I've tried pointing each gpu at different servers and separate wallets, but the same issue persists...  I haven't had this problem with mining litecoin...