Hey Darkbreeze, Thanks for the reply
My Bios version is 7C75vAC, which is latest released at 2022-06-15
Ram installed in optimized slots - 2 and 4
XPG ADATA GAMMIX D30 DDR4 16GB (1x16GB) 3200MHz U-DIMM Desktop Memory/RAM - AX4U3200316G16A-SR30
I think there is no problem with ram stick, i tried...