(redirected) Aurora R3 compatible with a GTX 660 or HD 7870 ?

I want to upgrade my R3 and bought a R9 270x to find out it is incompatible with it :emotion-9:

someone by dell tolds me the GTX 680 is compatible! (to expensive for me)

so is the ASUS GeForce GTX660 DirectCU II OC - 2GB Grafikkarte also compatible with the Aurora R3?