KittyFish62 :
While you are right that they have different targets, they can still be used for whatever you want. It doesn't have to be for gaming or productivity. A quadro would do just fine in gaming and so would a 1080 ti in productivity. Also, the Titan X and Titan Xp are actually aimed at gamers, so you're wrong about that side.
well Titan is more of a mixed bag imo, it cost too much for even an enthusiast gamer imo while the gain are too slight [about 9-12% +performance for almost double the price of a 1080ti], but the thing is, i read somewhere that titan's performance in productivity is pretty good, especially after some driver optimization, which leads me to putting the titan in the productivity side instead of gaming
also, i never said he cannot game with a quadro or vice versa, i'm just saying that each GPU had their own roles, although that doesn't mean u have to follow the role all the time
[though with their respective roles, the driver would also support them differently, which might give them extra edge in certain case]
i'm just amused on how that guy answers me without understanding the whole meaning of what i'm about to say [at least he could've ask first :/ before going into the bullsh!t part]
Titan's Advertisement: https://www.nvidia.com/en-us/design-visualization/products/titan-xp/
NVIDIA PASCAL TITAN Xp is purpose-built to deliver up to 3X the performance of previous-generation graphics cards*, enabling amazing new possibilities for creatives, researchers, and PC enthusiasts.
UP TO
3X FASTER PERFORMANCE
LATEST GAMING TECHNOLOGIES
NEXT-GEN VR EXPERIENCES
TITAN Xp Delivers New Levels of Performance for Creatives. Learn More.
it goes both ways for the Titan
it offers gaming performance and also productivity performance [at almost twice the price of a 1080ti....]
@OP, to answer your question
a single GPU would always be better imo:
1. opens up the chance for another GPU for SLI [should u require it later, u can have a 1080ti SLI]
2. 1080ti is a newer gen, offers decent performance as a single GPU solution
3. more VRAM, and also, faster version [11GB GDDR5X]
4. SLI doesn't meant it's 970 x 2 Vs 1080ti, the match would probably 970 x 1.6/1.7 vs 1080Ti, and imo, the 1080ti would still win [if the rules in terms of gaming performance applies to the productivity too]