Good evening. Can anyone come across a situation, there is a rig for 13 cards. 10 cards on the buffin work stably at 500 h/s, and 3 cards on the Lexa give out 515 h/s but regularly drop to 440 h/s and run at this speed from 2 minutes to 15 minutes, then the speed is again restored to 515 h/s. After a while everything repeats itself. The intensity reduced, alpha and beta, too, the same result.
now everything works with such settings:
     ^{{ "mode" : "GPU", "worksize" : 8, "alpha" : 64, "beta" : 8, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta" : 4, "index" : 3, "multi_hash":432 },
     { "mode" : "GPU", "worksize" : 8, "alpha" : 64, "beta" : 8, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta" : 4, "index" : 3, "multi_hash":432 },}

I tried with these, the same result
     ^{{ "mode" : "GPU", "worksize" : 8, "alpha" : 128, "beta" : 16, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta" : 4, "index" : 3, "multi_hash":432 },
     { "mode" : "GPU", "worksize" : 8, "alpha" : 128, "beta" : 16, "gamma" : 4, "delta" : 4, "epsilon" : 4, "zeta" : 4, "index" : 3, "multi_hash":432 },}

Drivers 18.5.1

the frequency does not decrease in these moments