Crossfire Mining with 5xx Series

[thecrasher]

Hello All,

I have bought Asus Strix 580 but unable to plug in into the CPU-neared PCIe Slot (Lack of space on mobo) so I plug in into the second PCIe Slot.
One week later I plug in another 570 card which is 4gb and Sapphire.
Begin mining...

Suddenly I have realised that crossfire is on. When I check the hash rates, RX570 performing better than RX580 which is 24.5mh over 24.2mh

Btw, I could not change the RX580 clocks separatedly.

What do you think?

https://i.hizliresim.com/aGy30O.png