Do I need a 750W or 850W?

secretumpiratica

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May 5, 2014
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Hello. I am building my first PC and I'm not sure if I need a 750W or 850W for my build.

My parts are:

FX-8350
16GB 1866
2 HDD
1 SSD
1 Optical Drive
970A-UD3P
CM EVO 212
2 R9 280X's

(no ocing)

How many Watts will I need if I don't crossfire and how many if I do?

Thank you.