crash完restart 唔見咗條ram

AMD x399 底版,插爆8條ram, 最近有時會突然restart , 之後就直入bios, 顯示有一條ram slot "C1" detect 唔到有ram.
之後再restart 就會正常返. 試過就算交換啲ram, 都係同一條slot C1 detect唔到.
冇超頻, 行2666mhz都試過. 牛3.3V 係正常.
有時唔係crash, 就咁開機都試過會detect 少咗一條ram.

CPU or ram slot fail

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