Long Story .... I first got a 28" Samsung U28E590 4K monitor and tried to use it with my on board video as explained in this thread.
Then I went and bought the upgrade memory, and a GPU to see if the screen refresh (after applying a filter in CS6 + Perfect Effects 8 or Topaz) would become 'instantaneous', and (wait for it), bought a GPU
that is not supported!!
I mean, come on!!! Of all the frigging GPUs out there I had to pick one that's not officially supported 
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© alphamalex [SHARE LINK] THIS IS A LOW QUALITY PREVIEW. Please log in to see the good quality stuff. So anyway, I still have the screen painting slowly issue and am now shopping for a supported GPU; probably an NVidia Quadro.
As far as the memory is concerned, I have felt an overall bump in Win 10, and PS, and am running my usual 50 tabs in Chrome with no issues now.
I could run lower res, and not have the PS screen painting issue, but that's not why I bought the 4K monitor for, right?
So to answer your question, yes it has helped, but any joys have been overshadowed by the GPU issue
