just got a new video card and it came with this cord. i know it's for power. it looks like a 4 pin connector but when u look inside it only has 3 pins. am i supposed to plug this into my power supply? do i need to plug them both in(both males)? http://www.ihostphotos.com/show.php?id=238011 can i buy a longer one at fry's because i can have my wires and stuff behind my mobo in the tray so it looks clean.