I am also interested in an 290x config - i cannot get it to hash YAC properly without too many hardware errors.
So if anyone is mining with 290x, share your config please.
ivan just posted settings for a 290 in this thread
https://bt.irlbtc.com/view/475569.120IMHO though, those cards don't have nearly enough memory to keep them busy enough to keep the shader pipeline humming along. All are welcome of course though

What makes you think so ?
We have MSI r9 290x with 4gb DDR5 on rigs with super fast 8gb DDR3 RAM.
We'have been mining very well MRC on scrypt-jane and some other n-factor coins until now.
But we have no settings for n-factor 14 and we cannot get it to hash properly with decent hash rate and little hardware errors.