For those, who need comparison data and interested in Claymore miner progress 
power of the wall
vX - version of Zcash miner
-i 6
GPU v8 v7 v6 v5 v4 v3 v2 Power on v8
7870 115 95 65 55 40 35 32 110w
7950 190 155 125 95 70 45 38 140w
7970 200 165 120 95 65 55 48 150w
270x 115 100 67 55 40 35 32 100w
280x 200 165 125 90 65 60 51 165w
285 125 110 85 70 40 36 32 130w
RX 470 4Gb 180 155 145 120 70 60 50 120w
power of the wall
vX - version of Zcash miner
-i 6
GPU v8 v7 v6 v5 v4 v3 v2 Power on v8
7870 115 95 65 55 40 35 32 110w
7950 190 155 125 95 70 45 38 140w
7970 200 165 120 95 65 55 48 150w
270x 115 100 67 55 40 35 32 100w
280x 200 165 125 90 65 60 51 165w
285 125 110 85 70 40 36 32 130w
RX 470 4Gb 180 155 145 120 70 60 50 120w
Got any idea how 290/290x/380/390/390x look in that table?
380 is pretty much 285 rebranding and for zec mining 470/480 is much better, I am very happy I bought RX 470 4g for ETH rigs instead of 285
don't have 290/390 but they do
Bravo Claymore!
v8 now gives me R9 390 = 270 H/s per card!
Updates:
R9 290 = 268 H/s
R9 290x = 278 H/s
RX 480 = 172 H/s
R9 Nano = 278 H/s
R7 370 = 110 H/s
v8 now gives me R9 390 = 270 H/s per card!
Updates:
R9 290 = 268 H/s
R9 290x = 278 H/s
RX 480 = 172 H/s
R9 Nano = 278 H/s
R7 370 = 110 H/s
3x r9 390 + 1x r9 290 = 1130w-1150w - 1120 h/s
3x r9 390 = 930w-950w - 885 h/s
3x r9 290 = 830w-850w - 725 h/s
in total 2730 h/s = 2890w - 2950w