They actually test with the two video cards you're considering, so this is a very good data source. I found an article on tests of GPU acceleration in Photoshop CS6 from Puget Systems - a small retailer I'd never heard of, but their methodology seems sound.
What should I consider for buying a photo editing computer?. What laptop specs are important for intensive image editing work?. To answer your secondary question, if you are using an older version of Photoshop that does not have heavy requirements on the GPU, you still need a graphics card to handle things like Windows and the actual display on your monitor, it just won't be used by Photoshop to offload the heavy tasks it does with many new features.Īdditional information can be found in other questions already on this site: If it is a desktop model, I personally would go with the CPU over GPU since it is likely you can upgrade the GPU anyways. If you are much heavier user of Photoshop, it is a harder decision, and really gets into the specific processor model and GPU model(which I won't go into here, and would be better suited for ). For example if you are a much heavier user of Lightroom, I would choose processor over GPU. If you have already maxed out your RAM and storage options, I would then decide which program speed and efficiency are more important to you. Photoshop generally runs faster with more processor cores, although some features take greater advantage of the additional cores than others. Photoshop CS5 and CS6 require a multicore Intel processor (Mac OS) or a 2 GHz or faster processor (Windows). Other features use the video card for acceleration and if the card or driver is defective those features will run more slowly. Some features require a compatible video card to work if the video card or its driver is defective or unsupported, those features will not work at all. Photoshop CS6 does utilize the graphics processing unit for enhanced performance. 
Additional RAM and a faster processor, in particular, can yield significant performance benefits. The minimum system requirements to run Lightroom are just that: the minimum you need for Lightroom to operate. Built-in, default cards that ship with most desktop or laptop systems typically suffice for Lightroom. Lightroom requires a video card that can run the monitor at its native resolution.
It is outlined in the Lightroom documentation here. Lightroom does not currently utilize the GPU for performance improvements.
You are asking two very different questions, because Adobe Photoshop Lightroom and Adobe Photoshop of course do not have the same system requirements or use the same system resources.
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