Not knowing exactly how to tell, I would say that it is a PCI-e connector, since I have never heard of a CPU that requires 6 pins of power. Some need only 4 pins, most motherboards now use 8 pins, and the highest end i7 boards use 2x 8 pin, but I have never heard of a 6 pin to a CPU. Just a common sense answer, feel free to disregard it.
"I always thought the 4-pin moles were reserved for lower power consumption accessories."
You'd be surprised how much power a 4 pin molex can (and will) provide.