Crossfiring two different 7990s?

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Drew010

Drew010

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May 11, 2013
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You can, but I would highly advise against it. There are massive heat problem when crossfiring the 7990 unless you are watercooling. Also I don't know why you would buy two different cards anyways unless you already have the Powercolor, I would just go with 2 of the Sapphires and watercool them.
 
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ingtar33

ingtar33

Glorious
Dec 17, 2012
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yes. xfire is NOT sli... xfire is much more forgiving then sli is and it will work just fine. Just know almost no programs are compatible with 4 gpus, so it's questionable what type of improvement you might have. (they'll treat that setup like 4 7970s in xfire); furthermore please put some serious thought into case cooling... the 7990s have shown to run too hot to xfire without some serious thought put into cooling.
 
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G

gkeylor

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Oct 27, 2013
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Ya I have already bought an powercolor 7990. That one runs at 60 C on max loads. I could just watercool the sapphire and I have 5 case fans already and looking to install a sixth when crossfiring. The only reason that I am getting the sapphire one over the powercolor is the powercolor is two inches longer and I had to remove my top hard drive housing to make it fit. The sapphire is two inches shorter and will fit in my case when crossfiring.
 
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