Vega 64 has improved since launch, beating the GTX 1070 in efficiency this past Sept 2017 by achieving 0.20 mHash/W over the 1070's 0.18 mHash/W. They're still

Vega 64 has improved since launch, beating the GTX 1070 in efficiency this past Sept 2017 by achieving 0.20 mHash/W over the 1070's 0.18 mHash/W. They're still within 10%, so it's not a great margin unless you're very focused on density.