I've been undermining for almost 4 days with a Core2 Duo and to this day I do not have a single ONIX drive in my wallet, and that I'm using the difficulty: 0.002.
Attached is a catch where I only see 22 miners mining and with few positive results (mine is one of 28.63 KH). Is it so much the difficulty of mining?
Imagen:
https://ibb.co/i2cQg5Hi the electricity went off today and I forgot to start back the mining so I just started it back will update you in 12hrs and let you know how the mining goes i'm only gonna use quad core system to see what happens with a low powered system. but a core2 duo you won't make anything really using that. I would say If you had an i7 8 core that would be okay for cpu mining