BS called and confirmed. 750 Ti consumes 72w from the wall with an 80+ gold PSU mining scrypt-N at STOCK clocks......putting out 135kh/s, autotune put it at T10x20 whatever that means.
Even if you take 80% efficiency (even though 80+ gold is 87-90%) that's exactly 60w draw at the card, which is it's TDP. I figured 40w was bogus, if it really only used 40w they would have rated it at that...they NEVER overrate TDP.
Edit- X13 consumes 50w and getting 1.3mh.
*wattage numbers are based off my system at idle running onboard video VS with the card in, idle wattage with card installed was about 10w*. Meaning, with just onboard my system consumed 60w at idle. With the 750 Ti installed it consumes 70w at idle, and under load mining 132w on scrypt-N and 110w on x13.