need a power supply

That 660w can run as high as a cheaper 850w.

Bit if you want the best, get a Seasonic X-850 if you must.

You mean the X-860, X-850 is the old version.

The AX850 is based on the X-860.

If you were gonna put them in order of performance X-860, AX850, X850, but for the user all 3 are practically the same in performance as they are so similar. With component variance you could get a X850 sample that is better than a X-860 sample they are that close.
 
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