Recs.
Updated
The Nvidia GeForce Titan X uses the newest Pascal architecture from 2016. The card is built for 4K gaming and handles any game at a decent FPS.
SpecsUpdate
Pros
Pro Extremely efficient
Compared to the AMD R9 290X and GTX 980, the GTX Titan X ran at similar temperatures (~80C) under a load, while outputting significantly more performance. Power usage was roughly in line with the R9 290X, but more than the GTX 980 - but again, it was offering much more performance.
Pro Amazing FPS when playing 4K games
BattleField 4 running at 4K yields a minimum FPS of 28, while the average is 37. Bioshock Infinite ran at at least 41fps, but averaged 55fps at 4K. Batman: Arkham Origins runs at a minimum of 55fps. The worst performing game was Crysis 3, which had a low fps of 23 but still managed to average 31 fps on 4K. Compared to the AMD R9 290X and nVidia GTX 920, the GTX Titan X constantly outperforms them by very significant margins.
Cons
Con Extremely expensive
Compared to the newer GTX 1080 cards, the Titan X doesn't offer much despite it costing roughly double the price of those similar performing GTX 1080 graphics cards.