PaulBlack :
http://www.bit-tech.net/hardware/graphics/2016/09/20/nvidia-titan-x-pascal-review/11
Every test has a titan Xp at 430 watts some people don't know the difference between power consumption and TDP because they are both measured in watts. tDP is the heat given off not the power consumption. I added all the things you need like gaming keyboards that are illuminated and gaming mouse.. 4 case fans.. there are 2 on the cooler... it all adds up.
this is the system power draw for the WHOLE SYSTEM.
as it is specified in both the chart and the text.
they say in the conclusion, and I quote: "Power consumption is course high compared to the rest of the Pascal family, but the fact that we're running an overclocked, eight-core system with a GPU pumping out frame rates that often average to over 60fps at 4K, a full system power consumption of less than 450W is pretty admirable – there are a number of SFX PSUs that can handle this with ease. Somewhat embarrassingly for AMD, the Titan X actually consumes less than the R9 Fury X all while being so much faster."
with a 8 Pin + 6 Pin connector it can't really draw any more than 300W.
here they tested it
guru3d test