How much Watt needs a Quad ATI Radeon R9 290 CrossFire?

aleejj

Honorable
Jan 29, 2014
5
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10,520
I'm right thinking about expanding my mining (Lite/Doge others) PC.

So how much amount of Watt will I need for those cards?

And eh, do I also need to upgrade my RAM, I currently got 4GB 1333 DDR3..Is it enough?