I have two mining rigs - identical hardware - identical windows installation, all drivers, and versions have been made completly same and at the same time.
What could be the reason of such difference?
https://i.imgur.com/NKNUW37.png
Don't mind for Balance, it's different because of other reasons.
Make sure to take a look at mining algorithm and daily profit
Left is mining ETH+Decred
Right is mining ETH+Decred and some GPU are mining Cryptonight.
Also Nicehash profit calculator is not always calculated at the same rate/time every instance. So it's normal.
If you press mining details you'll see which GPU is mining what and then you can rebench them.