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Crossfiring two different 7990s?

Tags:
  • Overclocking
  • Compatibility
  • Graphics
Last response: in Graphics & Displays
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November 17, 2013 3:15:41 PM

I was wondering if I could combine this card

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

and this card

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I know one has lower clock speeds and I can overclock that to the core of the sapphire one. Are they compatible for crossfire?

More about : crossfiring 7990s

a b K Overclocking
November 17, 2013 3:25:49 PM

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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a b K Overclocking
November 17, 2013 3:27:37 PM

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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November 17, 2013 3:35:17 PM

ingtar33 said:
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.


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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