r9 290x in crossfire PSU requirement

EchoKnight

Honorable
Oct 27, 2013
2
0
10,510
Hey all.
Looking to pick up an R9 290x for a new rig i'm building. I plan on only getting one for now, but setting up crossfire in the future. Will this PSU be adequate to run two of these cards:
SeaSonic G-750 SSR-750RM 750W ATX12V/EPS12V Power Supply
or should i bump up to something like this:
Seasonic 850W 80 Plus Gold ATX12V/EPS12V Power Supply

Thanks for the help!
 

kirilmatthew

Honorable
Jul 24, 2013
1,377
1
11,660