The RM 5600 XT works fine with standard settings of 40-41 megahash.
If you need to get a higher hash rate, then you need to flash the BIOS of the video card. Then you can get 44-45 megahash.
Different video cards may have problems, for example, the video output stops working, so you need to read the forums for each of the models.
I'm going no where with these MSI 5600 XT cards. I'm using MSI Afterburner to control the settings on the cards. I have Sync turned on so all the cards get the same treatment. If I lower the Core Clock to 1700 vs the stock 1780 the system eventually hangs with the Power Limit set to -10%. I ran GPUZ 2.37 and discovered three of the cards have Micron memory and one has Samsung Memory. The GPU Power Draw is 109W on the Samsung Memory card and 121,121, and 128W on the Micron cards. So...do I need to try OC'ing (Actually D-Clocking to reduce total Wattage used by this system) each card separately since they seem to have different characteristics? At least all the cards have the same BIOS Version 017.001.000.068.0000 if that means anything.
msi 5600 xt mech honestly not very good video cards for mining. These video cards have a very cheap cooling system. They freeze when overclocked. The optimal settings must be selected individually for each card. But use the early days at standard frequencies.