So I have one question left. I know the X-560 fan will not spin if it's not using enough power (under 20%), but will it spin if it reaches a certain temperature? Considering Seasonic states "The X automatically adjusts fan mode and speed according to the ambient temperature level." right on it's website, I would assume the answer to my question is yes, but wanted to know if anyone had experience with this. Thank You!
The X-650 and X-560 have the same fan controller, heatsinks and fan -- the fan behavior is virtually identical. And yes, it's directly tied to a temp sensor inside. Check the X-650 review for fan behavior details. http://www.silentpcreview.com/Seasonic_X650
page 4-5. The fan started to move when the exhaust air temperature was 35C, with a load of 150W in the hotbox. Since your case/system will not be as cooling challenged, I'd expect the air temp not to reach so high at that low a load; outside the hotbox, the fan did not start till well over 300W.