There is one, it's called the RX 460D, and it's for China only. Also the RX 460 is Polaris 11 and is a mobile GPU which didn't make the power requirements for laptop chips, whereas the RX 470 is a Polaris 10 GPU which was cut down from the RX 480.
thx for info. for me a rx 460 with around 1500 stream processors is better .actuall 460 lose to 1050 ti is to low i see in reviews. ican get a 470 but more power hungry. need 2 build mini itx with ryzen maybe a 4 core if availeable at lunch in march but low power in a small slim case like fractal design 202 .anyway i go for 470