Possible to use 10.10 drivers + 2.1 SDK with Sapphire 5830 Xtremes?

[ditchmagnet]

I read here that 10.10 or 10.11 drivers and SDK 2.1 were the best for 5xxx cards.  I have uninstalled my 11.6 drivers and installed the 10.10 drivers + the 2.1 SDK, but now phoenix, or guiminer, or AOCLBF don't work.  Guiminer says to OpenCL device detected.  I know many people have run into this, but I have not found a solution.

I have Win 7 64bit and Sapphire 5830 Xtremes.  I was getting 327 Mhash/s but I was hoping for a little more.

Thanks for any pointers.