CooLWoLF :
Title says it all. R9-290X rumored price of $599 worth it? Or wait till the R7 and R9 series are released and just go with a discounted 7850 and X-Fire my current setup?
Hi - until you know the performance and price of the 290x can't answer the question.
The $599 is rumored and the performance is rumored to be >gtx780 to Titan. But,
it's all rumor.
Personally, i would sell the 7850 & go with the best single GPU I could afford,
presumably the R9-290X. But, CF 2 7850's will be your cheapest upgrade.