Its DC-DC conversion, so while the 3.3V rail can provide 66W, and the 5V rail can provide 100W, those two are both created off of the 12V rail which has 28A or 336W, modern systems are pretty light on those two rails so that still leaves most of the 12V capacity available for the rest of the system, and its more than strong enough to handle that system with a 5570. Not sure what you are trying to get at dadiggle.