Here is an article about running both OS: http://www.macworld.co.uk/how-to/mac-software/get-el-capitan-on-your-mac-without-losing-your-existing-os-x-install-36235… PSD CS6 is running pretty good on my machine. It's is not as snappy as it was with Mavericks. But, both OSX and Nvidia have been getting regular updates and it is very hopeful. I'm running strictly on El Capitan as I've got some time before the next assignment. So far PSD, Premiere Pro, Illustrator, Audition and Encore CS6 have all been performing well. Microsoft Office has been experiencing glitches however. I do find that I have to run with Apple video drivers (rather than Nvidia drivers) on occasion if screen response is slow. But, then the next updates seem to fix them again. But, by all means, do run a separate HD and dual boot.
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