PS will make more use of the RAM than LR. Also, file size is a huge factor, so if you've got a D800 you'll need it all the more. The 30MB files of my 5D MkIII can be RAM hogs with DxO Optics Pro, if I elect to use DxO's PRIME noise reduction, then my 8GB is maxed out for around 5 to 8-minutes per file.
With my software, the graphics card isn't a huge deal, but, working in the Windows environment, being OpenCL enabled is big with DxO and some other softwares. Is OpenCL used with Apple's OS?
Dave
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