Minimum PSU for crossfire 280x

[habahut]

I want to crossfire the new 280x, currently I have an i5-4670k, which I would maybe like to over clock in a few years as technology moves forward. Currently I have this PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151120&Tpk=seasonic%20760w which is 760W Platinum.

Will that be enough power for what I want to do or do I need to upgrade?

 

[thenay]

Minimum, a 750W PSU. Preferably a good one like a Corsair or a Seasonic one, that should do the job fine.

 

[Anub1s]

Total power draw for the 2 x 280X's will be around 500W.

A 760W should be fine to run those and the rest of your system. However, if you're looking into overclocking that CPU and maybe the 280X's, you'll want something bigger.

 

[habahut]

Would it be worth upgrading to http://www.newegg.com/Product/Product.aspx?Item=N82E16817151120&Tpk=seasonic%20760w (860W gold rated)? Its on sale right now, so it would only be about $20 more expensive plus shipping costs of returning the 760W. But its gold instead of platinum, does that change much?

 

[Anub1s]

The 80% ratings are for efficiency, each PSU will supply the rated power to the components. But, depending on the efficiency rating, each will draw a different amount of power from the wall. The difference between amount of power drawn from the wall and how much is supplied to the components is it's efficiency.

So a higher rated 80+ PSU will draw less overall power from the wall while supplying the same 760W (as example) to your components, than a lower rated 80+ PSU.

If you're looking for head room and can wait the time it takes to return the one you have and recieve the new one, I'd personally go with the 860W to give you some room for overclocking.