850W Enough for Crossfire r9-280x?

Will14186

Honorable
Oct 5, 2013
6
0
10,510
Was thinking about getting an HX 850W Corsair PSU and was wondering if that was enough for a crossfire setup. Also I'll be OCing my CPU or ram. If I can do both great but I've read I can't OC the ram if have already OC'ed the CPU.

On a side note what do you recommend? Gigabyte or ASUS?