RX 550 2Gb - BBR - 940khs - is it normal or small? 
Not bad, best of cards doing 1MH/s. Have you tried --opencl-kernel 4 parameter? And only some custom timings, not available in public can do up to 1.3MH/s.is it possible to buy that custom timing ? I want 1.3 kh/s
my rx550 only doing 830kh/s what went wrong?