Anyways it felt like forever, but I was able to revert to 2.5 SDK. Bitcoin offer is no longer valid. If you're using windows, simply replace these files with those of 2.5 SDK and you should have your faster mhash back
C:\Windows\System32\amdocl64.dll
C:\Windows\System32\amdoclcl64.dll
C:\Windows\System32\OpenCL.dll
C:\Windows\SysWOW64\amdocl.dll
C:\Windows\SysWOW64\amdoclcl.dll
C:\Windows\SysWOW64\OpenCL.dll
I also uploaded a rar file with these dlls if anyone needs them to revert.
http://dl.dropbox.com/u/9768004/AMD-APP-SDK-v2.5.rarjust extract it to the drive you have your OS installed on and it'll extract each file to the correct path.
edit: forgot link.
! this saved my butt because i had copied the wrong files manually, even a reinstall did not fix it.