According to Steam Community :: Darksiders Warmastered Edition the game does not work well on AMD cards, either due to developer negligence or design. As there is little chance of them fixing it, AMD will have to develop a workaround in the drivers.
Thanks for the post, we're investigating reports of lower than expected performance.
Yes, there is a very low performance in general. At least for me that is not a issue, only in certain places.
R9 Fury X
but my question was for the crossfire, any plans ?
In another question Mirror Edge Catalyst had crossfire?