ya my first AMD build with 7800x3d and 32gb ram I was so pissed I put it all together had same issues as you so I first thought motherboard so I ordered a new one sent it the first one back ,then I thought that it was ram, then the CPU ...after a few days of this getting the new parts and installing uninstalling I heard about the learning thing and well I felt very annoyed and kind of silly for not first doing m,y research and jumping to conclusions of parts failure , once the ram thing finished and while stress testing the system I looked up how to set the ram speed to the actual speed and not the factory motherboard ram speed then I also learned how to turn off the ram relearn on every boot up .