v1.4.9
all work fine - 3*vega56

"cryptonight_type" : "heavy",
"double_threads" : true,
"gpu_conf" :
[
{ "id" : 0, "intensity" :56, "worksize" : 8, "threads" : 2, "target_temperature" : 59},
{ "id" : 1, "intensity" : 56, "worksize" : 8, "threads" : 2, "target_temperature" : 58},
{ "id" : 2, "intensity" : 56, "worksize" : 8, "threads" : 2, "target_temperature" : 57},

https://image.prntscr.com/image/LbOnbAGJSR65QvOTuaZPGg.jpg