3D Game Man posted a review on RaptoxX RT-750 and RT-1000 PSUs

Over all the Exxtreme series of power supplies from RaptoxX has proven to be a stable and reliable product. It is not surprising to see the RT-750 rate lower than the RT-1000 given the lower wattage rating, but I was surprised to see the weakness of the 12v rails on the RT-750. The RT-750 (looking back to the specifications) only has three rails and each vary on their numbers. The RT-1000 has a much stronger rail system featuring four 12v rails and each have plenty of amperage.

RaptoxX RT-750 and RT-1000 PSUs