Can I Crossfire a Reference card with a non-reference card?

AcFree

Honorable
Sep 25, 2013
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10,540
I have a reference AMD Sapphire 290X and I was wondering if it would be possible to crossfire it with Sapphire's non-reference Tri-X OC 290X? Would this cause problems or would I be better off selling the Reference card and paying the difference to get 2 of the same model 290X's?
 

AcFree

Honorable
Sep 25, 2013
27
0
10,540
Would the stock clocks matter at all? for example stock clock on my reference card is 1000mhz. The Tri-X version is 1040mHz would I need to match my clocks up?