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I checked and the Dell8910 has one 16gb RAM card installed and another 3 slots up to a maximum of 64gb, so should be ok for that.
If just paying an extra £500 for the 1080 I might hang off and see how the 1070 performs in real life usage-most comparisons I've seen are quoting a c.16% difference in favour of the 1080 for rendering which doesn't sound life or death. I think Unity and Autodesk cloud services will also take the strain off anything genuinely meaty.
I've just been using Photoscan as I got a free license through my old Uni that's never expired-it's actually one of the few programs that has run ok on my Mac 2011 powerbook
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I checked and the Dell8910 has one 16gb RAM card installed and another 3 slots up to a maximum of 64gb, so should be ok for that.
RAM running in single channel mode? [sucks teeth and shakes head]
In truth it may well be one of those things that you need to benchmark in order to tell the difference. Wouldn't be surprised if things like photo/video editing and 3d stuff were the sort of applications which benefit from dual channel operation tho'.
Does seem a strange way to spec a new machine. Makes me wonder if it's simply because 1x16GB module is a bit cheaper than 2x8.
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.