I need to know about the R9 290x XFire

If you have used the R9 290x XFire, please advise me how it performs in a game or when idle. I need to know its specs and performance including power consumption when it both idle and load states. Does it have issues in high end games or does it make noise and overheat at times? If crossfire is working without issues in compatible games, please inform me too.
