Hmm wonder what's up with all the different skus of my card with identical setups
I actually asked the same question previously on the forums. There certainly are more models to choose from than other manufacturers, and it's a bit confusing, but they are
not identical.
Going to XFX's website shows there is a difference in the custom cooler shrouds and the factory boost clocks. Probably means a difference in the binning as you are guaranteed stable factory OC clocks.
I looked at the spec sheet and there is no mention of a Dual BIOS on this card, which probably means that the switch does nothing as it could use the same PCB as the higher tier card. Just to be sure, I would call XFX and ask if your card has two BIOS memory chips and if there are two different profiles loaded.
http://xfxforce.com/en-us/products/amd-radeon-rx-400-series#RX-480-8gb
However, if you needed to flash a single BIOS chip, here are profiles from XFX:
http://xfxforce.com/en-us/support/bios-files
Your particular model has a Factory OC of +22Mhz to 1288Mhz Boost.
This extreme overclock may be too much for you, but never fear, there is a simple solution!
In Afterburner, just move the slider for the GPU clock to -22Mhz, then the card will be at the Stock Boost speed of 1266Mhz.