Enough power for 280X crossfire?

lobsterone

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Jul 25, 2010
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Hi, my power supply has 2 12V rails with 21 amps each.

I believe this equates to around 250W for each rail.

This is apparently barely enough for 2 new Radeon R9

280X... I want to buy a Radeon R9280X now and buy

another one for crossfire in the future. What I want to

know is if I could maybe reduce the power output by

underclocking the 2 cards. Also, I have an i5 4670k and

a samsung 840 ssd. On the power supply:

3.3V -> 24A
5V -> 32A
12V1 -> 21A
12V2 -> 22A

Thanks!
 

gamingboy

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May 5, 2012
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Now is probably a good time to buy a new PSU. A 750W PSU would be a good minimum. Now.. What would be your budget?
 

lobsterone

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Jul 25, 2010
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To be honest, I'm not really interested in buying a new PSU. basically I just need advice on what graphics card to buy now, or upgrade solutions for the future. I'd even be ok with a R9 270X now and then buying another 270X for CF down the line.
 

gamingboy

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May 5, 2012
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I'd highly recommend buying a quality PSU. Worst case scenario is that your PSU breaks down and takes half the system with it.

You'll probably be ok with having a single 280. Any sort of Crossfire with that PSU would not be a good idea. There's not enough juice.
 

j Grewal

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Dec 31, 2013
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600w is good for one video card.. i have 2 msi r9 280x.. using one with 750w psu.. minimum psu says for one r9 videos card is 500w.. (says on videos card box) for 2 is 1000w.. Plus ur cpu n other things on psu so.. get at least 1000w or 1050.. spend money once n never worry about it..