MSI RX470 Armor 8GB OC performance

Hi colleges!

Im testing my new rig, I have bought 6 MSI RX470 Armor 8GB OC (Samsung ram equiped on them) with default settings it runs between 22 - 24MH
I want to set the best settings to get the best performance. Now Im testing testing only with 2 of them.
Ive read about to mod bios or to set values using WattTool or afterburner software.
But Im confused about what are the most efficience parameters without mod flash to not avoid the warranty.

I think that I can get better performance on my test and after that copy for my 6 GPUs

Could you give me some advices to increase some MHs??

Million thanks !!!


I attach my current default settings