Crossfire 280x with 280

Solution
No, they have to be the exact same video cards.

However you can do it by a different company, like putting a MSI r9 280 with a gigabyte r9 280 would work.

Drew010

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May 11, 2013
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That's actually incorrect. They just have to have the same GPU. For example you can crossfire a 7970 with a 7950, 7870XT, or 280X.