I7-3770K OCed to 4.5Ghz
GTX 560Ti SLI Oced (slightly)
G.SKILL 8G Ram (2400)!!!
oh...and I'm watercooling the whole thing so i pushes voltage to my swiftech commercial pump.
...all these and it doesn't sweat.
I've had it since January-Feburary (I forget) and it's running like a charm. It's the best price/value PSU i've ever bought.
The only thing I wish I could do (it's why it's cheaper) is that I wish I could have been able to remove some of the power cables by simply unplugging them. Trying to hide all these cables (even those that are being used) is a hassle. I'm having a hard time even with a NZXT Switch 810 case!
That's just one card from one AIB (and the OP does not even mention that card) so I would err on the side of caution and refer to the folk who actually made the GPU in question.
No but an overclocked card uses MORE power than a standard card, so a standard card would use less than 137w. Nvidia is likely stating maximum TDP. Nvidia also recommend a MINIMUM 450w psu in the link you posted, and we all know on my system with a quad core Ivy Bridge cpu and a 660ti, even my 380w psu would still have over 100w of headroom.