How do I install two graphics cards?

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xPorkchops007x

xPorkchops007x

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Sep 24, 2013
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I have a more complex question than what I named the title. I have the computer parts listed below, and I want to install the Radeon 7790 with a Radeon 7750 I have in my other computer. The Radeon 7750 however, supports CrossfireX BUT DOES NOT have a CrossfireX bridge plug for me to plug both cards together with. So here is a summary of what my situation is:
My radeon 7790 supports CrossfireX and has a bridge plug to connect both cards together, but my radeon 7750 supports CrossfireX, but does not have a port to plug the bridge into. The 7750 is meant to plug into the motherboard and be ready, but the 7790 I THINK requires a bridge.
So my QUESTION is, can I use BOTH GPUs without the bridge?

Here are my PC parts that I bought:
Optical Drive - http://www.newegg.com/Product/Product.aspx?Item=N82E16827151266
PSU - http://www.newegg.com/Product/Product.aspx?Item=N82E16817182278
Case - http://www.newegg.com/Product/Product.aspx?Item=N82E16811156269
Processor - http://www.newegg.com/Product/Product.aspx?Item=N82E16819113284
Motherboard - http://www.newegg.com/Product/Product.aspx?Item=N82E16813131874
RAM - http://www.newegg.com/Product/Product.aspx?Item=N82E16820231428
HDD - http://www.newegg.com/Product/Product.aspx?Item=N82E16822148840
Radeon 7750 - http://www.newegg.com/Product/Product.aspx?Item=N82E16814202002
Radeon 7790 - http://www.newegg.com/Product/Product.aspx?Item=N82E16814127726

PLEASE HELP!

(Please help only if you know what you are talking about)
 
Solution
Skeefers
You can't use Crossfire with 2 different model cards, unfortunately, in the case of the 7790 (link here, relevant quote is "The operation of AMD CrossFire™ technology in dual mode requires a second AMD Radeon™ HD 7790 graphics card and an AMD CrossFire™ Ready motherboard."). You would also need to be able to connect the bridge to both cards since the 7790 doesn't support Crossfire over the PCIe slot like the 7750, so the only way I know of for you to be able to use Crossfire would be to purchase a second (preferably identical, since you know it has the bridge connection and will be compatible) 7790.

Edit: I guess you could also purchase a second (again, identical) 7750, but why go down when you can go up.
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Pallimud

Pallimud

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Nov 30, 2010
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Since these are low power cards, they don't require you to connect them together with a bridge. You should be able to connect them normally and run crossfireX via the motherboard. It would be nice for someone to verify this, but I think you're probably correct in your assumption (that's what I've been reading too).
 
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Pallimud

Pallimud

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Skeefers

Skeefers

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Aug 7, 2013
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You can't use Crossfire with 2 different model cards, unfortunately, in the case of the 7790 (link here, relevant quote is "The operation of AMD CrossFire™ technology in dual mode requires a second AMD Radeon™ HD 7790 graphics card and an AMD CrossFire™ Ready motherboard."). You would also need to be able to connect the bridge to both cards since the 7790 doesn't support Crossfire over the PCIe slot like the 7750, so the only way I know of for you to be able to use Crossfire would be to purchase a second (preferably identical, since you know it has the bridge connection and will be compatible) 7790.

Edit: I guess you could also purchase a second (again, identical) 7750, but why go down when you can go up.
 
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