Power draw should be right around 500W actually.
No, it would not be a more powerful solution for a gaming rig than those.
the Titan Z will cost $3000, although it will provide 5760 CUDA cores with two Kepler cores inside of it, 12GB of memory, and 8 teraflops of computing power. Oh, and it will consume 2000 watts by itself.
http://www.pcworld.com/article/2111540/nvidia-announces-pascal-gpu-3k-titan-z-graphics-card.html
Got that figure from here, I thought that it couldn't be right. This card really makes no sense from a gaming perspective.