S905X is a cost effective model based on S905, the greatest spotlight is that S905X supports VP9 decoding while S905 not.

Another one is the price. As a newer model, S905X has better performance, however, the price is same or a little lower.

Last,  S905X is tailored to Android 6.0, while  S905 is for Android 5.1.

The following table is the detail difference between Amlogic S905, S905X and S912:





Our three typical products for your reference.

Amlogic S905  TV Box	Amlogic S905X  TV Box	Amlogic S912 TV Box