Quote Originally Posted by STEvil View Post
PCI-E slot power is usually only linked to a set component on the card which will keep it at or under PCI-E spec which is 75 watts for the slot itself. The power regulation circuity of the card should not have to worry about load balancing between the power connectors and the pci-e slot.
I agree but that doesn't always happen. PCI-E slot power for the 2.0 spec is rated "up to" 150W, hence why some mobo makers have used auxiliary power connectors on their boards for the slot while retaining the PCI-E certification.

However, as I have said in the past: the 75W spec is usually adhered to in order to guarantee backwards compatibility.