That sounds like I'd have to go to strictly HCC to do it that way. I run a mixture of projects (almost everything!). Do I just leave my computer running as it is?
David the app_config can be set to run 2, 3 or 4 GPU WUs. The numbers you input in app_config will regulate whether you run all GPU WUs or a mixture of GPU and CPU WUs. The choice is yours to make. GPU crunching is much more efficient and a better use of your available resources. There is only ~ 80 days or less worth of ati_hcc1 WUs left. You should consider maximizing your results inputs by going all out for GPU WUs. You can always return to the CPU projects after the GPU WU bonanza is exhausted.

In summary: If you wish to continue with crunching 3 CPU WUs and 1 GPU WUs do nothing.
If you wish to go all GPU or do a 2x2 or 3x1 GPU to CPU split then post what you desire.

Folks will then generate a pertinent app_config file and guide you on how to insert it into the appropriate BOINC folder.
Have fun with your new 7950... It is a very good crunching video card.