R7 269x R9 390 Crossfire?

[Radlaserlava]

Can you crossfire an ASUS R7 260x and a xFx R9 390?

 

[DSzymborski]

You cannot. Nor would you want them to - even if you could crossfire a 390 with a 260x, you'd essentially get the result of a 260x crossfired with a 260x.