None of this matters as the GeForce GT630 (not overclocked) is spec'd to draw a maximum of 49 Watts in current models.
There is one model that draws 65 watts (not overclocked) that might be a problem:
-
http://www.geforce.com/hardware/desktop-gpus/geforce-gt-630/specifications
PCI Express v1.0 only specifies 55 watts to the PCI Express x16 slot, not 65 watts (v1.1).
- Some PCI Express v1.0 boards can do more, and some v1.1 boards do not do 65 watts stably.
This is why many <= 65 watt Video cards got re-released to have the 6 pin power connector, and some were recalled.
Either way, the GT630 is a terrible GPU.