In summary, the 12VHPWR has 12 pins, each fitting into a 3mm square spacing (8-pin Molex spacing is 4.2mm) in two rows, for a 18.85mm wide connector, which is just a tad wider than the old Molex 8 ...

On page 4, there is an "IDE Power" connector. It looks a lot like a 4 pin CPU fan connector, but it (obviously) provides different voltages that are appropriate for 3.5" IDE drives (5V, 12V) and ...