In bios there are only options- default (2133) and XMP (3000, which I use).
Yes, at the beginning I had 2x4gb sticks of Patriot Viper 4, DDR4, 2x4 GB, 3000MHz, CL16 and then bought one stick of GOODRAM DDR4 IRDM X 8GB 3000MHz CL16, I don't know if it could be the case. May it be because of the...