Videocardz has put an article with some of the custom RX 480 cards that will launch. I have to say that I'm disappointed, I was expecting that at least one of them would work on a "mini" 480.
http://videocardz.com/62059/asus-msi-gigabyte-powercolor-and-sapphire-custom-radeon-rx-480-pictured
Both the MSI Gaming X and the Gigabyte G1 will have a passive mode.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.