T3h_Ch33z_Muncha

Well according to the eXtreme power calculator, your system with two 4870's would use ~500W at absolute 100% peak load (which you will never ever reach).

since your PSU should get about 80% efficiency, this gives you ~600-650 watts. (i don't know whether the calculator takes this into account or not)

so i would say get the second 4870, because even at max load it will still provide them sufficient power. And if it doesn't, then buy the PSU, not first up.

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Please don't call me Muncha, as cheese is not the only insinuatable munchable object; Ch33z will suffice. Oh, and i almost forgot to express my love for Heru
Planned upgrades (kind of in order): 22" Monitor, Goliathus Omega (mousepad), new chair, Windows 7, CM 690, new desk, Ideazon ZBoard MERC, Sennheiser HD201, bong, DX 11 card(s)+necessary PSU
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DesertRat

crossfire 4870s. you have a good 650W PSU. I'd bet your PSU could handle it A-OK as long as you don't have HDDs out the wazoo.

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Inktfish

I don't know about the PSU or Crossfired 4870s
But!
In some games you will run in a lot of problems with crossfire.
So it might be only one of your graph cards will be used.
Now a 4830 is way less than a 4870 so you need to think about situations like this as well.

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Ladiesman101

Keeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee eeeeep

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E8400@ 3.962 stockvolts W Noctua
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waylo88

Looking at this:

http://www.hardwarecanucks.com/forum...review-11.html

It looks like the gap between a 4870/4850 xfire and 2 4870's is minimal.