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thanks very much again for the input-a big outlay so good to have reassurance I'm not going to be either stuck with a pig in a poke or alternatively, spunking money up the wall on too much capacity that I won't need/use. Will go with the cheaper Dell and hold some cash back for more RAM if it looks like it needs it.
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I'd also be concerned that the Dell would make upgrading potentially more tricky. See @Ordinata's PSU experiences for example. Reckon on 16GB RAM being a bare minimum for any 3D or video-related stuff these days, particularly if you want to be running other applications simultaneously. Photogrammetry can be very memory intensive.
The processor in either is definitely decent enough and there's no point having the 'K' unless you want to overclock it, something which shouldn't be necessary anyway.
As previously said, forget about the Quadro or AMD equivalents. Completely pointless waste of money, even for most professional applications outside proper full-on CAD.
What photogrammetry software are you using? Both Reality Capture and Photoscan rely heavily on GPU rather than CPU for processing, so the 30% more CUDA cores in a 1080 would definitely be beneficial for that.
Brun
whats @duncs said.
I used to run a 950 which most PC gamers would tell you is barely worth calling a card, especially at 1080. Played games like GTA on decent (medium to high) settings just fine. A 1070 is loads more powerful (and I am sure that translates to 3D gubbins too not just games).