Rectification, the TDP (utilization) is for the cpu. Because the cpu don't run at 100% load all the time. You can find this equation in every good calculator.
With a 650w psu, you are at 68% (442w) of the max load.
As long as you are in the range of the high efficiency (40% to 80% of the max load).
My system needs 615w, my Seasonic X-850w is totally noiseless. I'm at 72% of the max load. 89% efficiency.
Corsair AX850 is based on the Seasonic X-Series platform and for all intensive purposes.
Agree. This is why you should know what you want, one or two video card.
550-650w bronze certification for one video card.
750-850w gold cert for two video cards.