It is necessary to include PCI-E GEN3 everywhere. In the rig with the i3 8400, this changes the speed from 700 to 1000-1100. On the rig with the g4400 processor nothing has changed and the card 1050 gives still 150 h / s. The CPU load is 100% on all rigs and more than 1000 h / s with 1 rig is not obtained. Pentium g4400 it does not work out more than 700-800.

You can put at least as many cards as you like, but you can not get 1000-1200 hashes from 1 rig.