I have a problem with memory support in memory slot B1. The memory modules are functional because they all work correctly in the other three memory slots. The problem starts when I insert the memory into the B1 slot (closest to the processor). I cannot turn on the computer when the XMP profile is loaded. After a few reboots, the computer turns on from memory with a default frequency of about 2000MHz. The maximum frequency is 3200 for the B1 slot but still memtest shows a lot of errors. Slot B1 does not work correctly. Others work fine. Is it the motherboard or processor fault? What should I give back for warranty?