his rx470 4gb crash with zcashgpuclient_silentarmy.exe
driver 16.9
windows 10.
Also,i run with zcashgpuclient

v0.1 ~16
v0.1.1 crash
v0.2 ~17
I've just setup ubuntu 16.04 and results is perfect
rx470, rate >22sols/s
here is my test wallet:
http://coinsforall.io/#!/coin/ZCASH/wallet/ztLtdxedZy6UVymhM3Q5X3T94jNJPtRa4v2LVWotKWEeQ1RRgwLHNSPxZiGeLWyFBxuqqpMNnM4iq5PBnR2oTve5syfSmvn
but dual silentarmy not work well, it's less than single sols/s