what gpu for my 600w psu r9 370x or R9 280 NOT o.c.

posts0 warning pointsLocation:treasure coast florida

I have a 600 watt psu and want to buy a card that will run the game (fallout 4) but i am afraid i wont have enough watts for a R9 280 running stock speed or can i run r9 370x (over clocked). Im guessing i dont have enough watts to run over clocked gpu. I want to run the game at med-high settings but will not run AA all the time. What card should i get?? 

If i went with the r7 370x (oc) would i be able to run AA and med-high settings?? 

here's a link to my answer in your other topic asking more or less the same thing.

http://forums.whatthetech.com/index.php?showtopic=130292#entry873686