ur investment was in vein from the start 3x 390x? what for a game that u can confortably play one 1 gpu its just overkill and the other thing that its been for years is that dual ,triple or more gpu crossfire or sli are poorly optimised for gaming with the money u invested in those 3 u could of just got a gtx 1080 or a fury x and save some money.
I hold a different idea though. I am a loyal AMD fan, have been using AMD graphics from 9500 to 7970 to 295x2 and to triple 390x. The reason why I bought another 390x is that I am playing overwatch on 4k display with ultra settings. One 390x is not enough for that, dual 390x is fine.
In order to get ready for some other more demanding games such as GTA V and others, and since I already have dual 390x, I thought instead of selling them on ebay for one third of the price I paid, buying another one to form a triple CF would seem more reasonable.
Still, I am just posting the issue I have with the fact that I am using triple crossfire, and hopefully AMD can add overwatch support in case there are other gamers with similar issues.