I've tried out the new official beta drivers on a small test rig, there was no need to apply the 'atikmdag-patcher' patch.
With 17.7.1 drivers I get 59Mh/s with beta drivers I get 61Mh/s.

http://support.amd.com/en-us/kb-articles/Pages/Radeon-Software-Crimson-ReLive-Edition-Beta-for-[Suspicious link removed]pute-Release-Notes.aspx