incorrect , i used win7 64bit and 16.12.2 , rx480=238H/s . The best speed of rx480
Some of my testing was on RX 470s, and ALL of it under Win7.
16.12.1 lost a little over 10 sol/s per car vs 16.9.2 or 16.10.1
I doubt 16.12.2 would be any different, but I concede I've not bothered testing that specific version.