Dear all
i have R9 285x 2GB working stable for mining ETH. since 5 months ago , it was run fine in claymore 6.4,7.4 and v8.0

Now it is  stop working to mine ETH or ETC  , ZERO hashrate on it

but it is working fine to Mine Zcash v12.2 with Win7 16.9.2

i try to change Riser,PS,Operating system,Rig, and result nothing
i try to test different Driver and nothing

Note that i have another Card with same specs and running fine in ETH with 20MH/s

please help Awaiting your reply