that link says 2gb...
I should have results to post in 24-48 hours.
My HD7950 3GB is doing 20 MH/s ETH & 420 MH/s DCR so the RX460 4GB should do better if you want to break down the 7950's specs.
GPU0: Powercolor R9380X
GPU1: Sapphire HD7950
http://imgur.com/OHu9INh