th agp voltage is the voltage thats runns off the agp slot, and it depends on the transfer rate of the card. AGP4x runs off 3.3 and never cards like the 9700pro are 8x and run off 1.5v agp. It can run in 4x mode fine also. the external power connector isnt the agp voltage, its just there so it can get a cleaner voltage(straight from the power supply) to supply the core and memory with.