One of my miners is relatively low powered and becomes disabled by the time the difficulty reaches an acceptable number. I've read the site about setting difficulty and using the workers password. I'm using BFGminer 4.4.0 and it doesn't display the difficulty as the standard 64, 128, 256, etc... Rather, 15m, 3m, 976u, etc... I'm guessing I'm just going to have to play with numbers, but does anyone know how these numbers correlate?
What BFGminer displays conforms to the correct definition of difficulty (which is the one that has always been used for the network hash rate). A difficulty of 1 corresponds to what scrypt miners usually call 65536.
Since share difficulties can be much smaller than 1, BFGminer uses
SI prefixes to display them. So, m=10
-3 and u=
µ=10
-6.
Le me make an example.
976u = 976 x 10
-6 = 0.000976
That's a difficulty by the good old definition. To get the share difficulty that scrypt miners are used to, you multiply that by 65536, and get 63.96. Keeping in mind that the difficulty displayed by BFGminer is truncated, that probably means 64.
Another example:
15m = 15 x 10
-3 = 0.015
Multiplying by 65536 gives 983.04. Due to the aforementioned truncation, that is of course just an approximation; since powers of two are normally used, the actual difficulty when you see 15m is probably 1024.
If you have issues setting up your miner, I suggest that you write an email to support including your exact configuration.
