I saw the pic, but anyway you can see a lot of pics on macvidcards or same. My opinion comes from 2 major facts.
First, BMD developps the app and makes a lot of tests, especially Dwaine afaik, and I think we can sometimes listen a bit of what they reckon, which is to opt for a single strong and very much "nvrammed" GPU now... Only a few examples (like 4 GPUs) would really take advantage of a gui dedicated extra card. Still BMD recommendation fyi.
Also, given that CPUs are not to be changed so easily and frequently and that Resolve is strongly GPU-centric anyway, I don't think that this GPU case needs the change of CPUs, except if you really experience lacks in plenty of others apps (and if you're sure the cpu is faulty).
Now, my personal 2 cts; I have a lot of works and usually try not to waste my time with things like that, I'm no gamer... This leads me to often adopt the best solution,
which is the upgradable one imho : thus buying a gtx 1080 ti won't prevent you to buy a second one in case you're not satisfied, that's all