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Don't bother. If the driver is installed and configured properly, PS will auto-configure to make best use of the resources. Only play with the settings, if you experience problems. Likewise, graphics drivers will auto-configure when installed and make the best of the system's resources. Noel Carboni might have to say a thing or two about which AMD driver is the best, but beyond that you realyl shouldn't waste a second thought on this or endless time pushing knobs. In fact you may only screw it up that way and then have to reset to factory defaults eventualyl one way or the other...
Download and install the ATI Catalyst 13.3 beta 3 driver. As of this writing that's the best version for Photoshop currently released. I've been running it for a month and it's solid and quick with Photoshop CS6 Extended.
And Mylenium is right; pretty much you want to leave your Catalyst settings on "Use Application Settings". The overrides are more for gaming. These are the settings I'm using:
AMD Overdrive should be left off if reliability is important.
With my 7850 I can turn everything on in the Advanced Photoshop settings, though you will find the [ ] OpenCL setting getting shut off on its own if you switch back and forth between using the 32 and 64 bit Ps applications.