Sorry, I shoulda clarified, I'm on a GTX960 4gb RAM. It was purchased last year, whereas my cpu is core i5 from 5-6yrs ago (maybe even slightly older than that).
I do find it peculiar that when checking PS and the GPU acceleration area, it's ticked already for me as default upon installation ie ive never had to check the box, but it is there ticked already, and it's clear as day that its working for me ie fast response, way faster than the 'non ticking' GPU acceleration that I have to put up with in LR.
I thought the pull down menu would still exist for those with onboard mb gfx as well tho? Your menu says 'Intergrated Graphics (default)' which to me suggests the same as what I have on my mb?
"If you’re using a smaller screen and/or a slower processor" - that petapixel article linked above, I think this applies to me, I'm also 24 inch 1080p.