...however for CG rendering there is no "overkill" when it comes to VRAM. With 1080 Ti's priced over 1,000$ (I've seen them as high as 1,400$) and Titan XPs pushing 1,700$ It almost becomes more worth it to go for a Quadro P5000.
Yeah I get a bit of flack form many in the CG community about Quadros not having the high core count of a 1080 Ti or Titan, but in this biz, VRAM trumps cores for if you create extremely large detailed scenes and render in large format resolutions, you're going to need all the memory you can get. Once a render process dumps to the CPU (Iray), those extra thousand or so CUDA cores mean nothing and you are stuck in the "slow lane" which can take hours, if not days. 16 GB pretty much would cover 100% of the scenes I create. If I want more cores for speed, I'll look around for a Tesla K10 compute card (for a few hundred on ebay) and slap that in. Bang, I now have 3072 more cores to add to the P5000.