unlike sli, crossfire works also on slightly different gpu-s so technically it's possible though you may see artifacts. try it and share your results
Cross fire is less strict than SLI but the general thumb of rule with cross fire is you can pair both card as long as they got same chip inside. that's why you can CF 7970 with 7870 XT since both card have same type of chip inside. but the best combination still using two exact card
unlike sli, crossfire works also on slightly different gpu-s so technically it's possible though you may see artifacts. try it and share your results
Cross fire is less strict than SLI but the general thumb of rule with cross fire is you can pair both card as long as they got same chip inside. that's why you can CF 7970 with 7870 XT since both card have same type of chip inside. but the best combination still using two exact card