Hello.
I tested 2 small rigs on minexmr.com
Started both at same time, on the same pool, on the same internet line, but on different xmr wallets. Used same miner (claymore cryptonote 10.2)
First rig (rx 470 + rx 480 + rx 470) 2360h/s earned 0.04xmr for 24hours
Second rig (rx 580 x3) 2560h/s earned 0.035xmr for 24hours
Anybody could explain me how 2560h/s rig earned more than 14% less than 2360h/s Rig?
I was trying to understand it and checked workers graphs (check attachments). There is sometimes hashrate droped to 0 on second rig. I checked miners logs and there were no any diconnects. Just claymore mined dev fee at same time. Just a few seconds, but the graph looks like my rig didnt work for 10-15min every time. First rig worked with dev fee on too but there is no any drops to zero on the graph.
So i'll be happy if someone can explain me what's wrong with my second rig and how can i fix it to mine as good as first rig does.
I'm sorry for my english.

https://gyazo.com/27418f147a73db1326448db27301bd1c
https://gyazo.com/40929c2564067bd7f423fb4bd96fe43e