one reason I have the 1650S inbound is because I can get a short version, vs the 570. Maybe they exist, but I didn't see one. A short card should make fitment much less problematic (and hopefully I can plug in my front ports again). The lower power is another nice benefit. One reason I went with the super vs, the vanillia is that the super has and external power plug, so it shouldn't be an issue if the mobo can't handle the full 75 watts its supposed to supply to the PCIe slot. The 570 isn't drastically more, but at 150 watts, it is asking for all of the PCIe power and all of the rated 6 pin power. Now some PSUs can handle more power on a 6 pin and are basically 8 pins, but I honestly don't know how the cards power management is set-up. does it all go to a common 12v bus? no idea.
MOD EDIT: Reference removed, we don't need to encourage a thread hijack.