I have 2x 480 NITRO with no problems on windows 10 64 bit with claymore 7.0 and latest 16.9.2 hotfix drivers
set GPU_MAX_ALLOC_PERCENT=100
set GPU_USE_SYNC_OBJECTS=1
set GPU_MAX_HEAP_SIZE=100
set GPU_SINGLE_ALLOC_PERCENT=100
EthDcrMiner64.exe -epool eth-us.dwarfpool.com:8008 -ewal WALLET -epsw x -dpool "WALLET" -dcoin sia
hope it helps
I have the same but with -gser 2
I have 5 of these cards but it always crashes on start. I resetted the computer, installed latest miner and driver. Changed virtual memory settings. Still crashes