If I'm not mistaken, 7x series and 5-68x series are different enough that the OpenCL SDK versions aren't compatible. You can run a 5x and 6x together, or later models of 69x and 7x together...No way that I know of to install both SDKs/Drivers though. 
Okey but what if i use the 7950 and 7870 in the same system will it work better?
Also what about Mining OS(s) like BAMT, is there any other that are relativly new so it can work with 7x series?
Thanks for the reply