pci-e (slot) = 75w
pci-e 2.0 (slot) =150w
6-pin =75w / 108w??
These numbers are from random googling and are the complete opposite of the question you are asking
Nvidia says 236w
How many 8 pin pci-e plugs do you have , Are you using a converter that connects 2 gnd leads to fool the card?
I have no idea whats going on ,I just like typing
2500K 4.7ghz,P8P67Pro,120gb Force3, 8gb Vengeance,GTX970,TX850v2,W7HP,LaCie Blue 22" crt COMMODORE 64 Silver Label 1Mhz/128D 4Mhz(Z80)