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://i.imgur.com/OHu9INh.pnghttp://imgur.com/OHu9INhFrom a specs standpoint, the 7950 and RX 460 are in very different leagues.
The 7950 used to be AMD's 2nd highest end gaming card, and has a memory bus 3x as wide and 2x the shader cores.
And of course, that's not ETH. (Epoch #13, Musicoin perhaps?)