Windows 10: Pc ram slot 3 and 4 randomly stopped working

Why are we putting RAM sticks into 2nd and 4th slot first? ram slot 13 or 24 If you have 2 4GB RAM cards and 1 8 GB Card then the two 4GB cards go in slots 0&1 And the single 8GB card goes in slot 2 If you have 2 8GB ramses legacy slot if the channels do not match or if the system has only one dimm installed, the system memory operates in single-channel mode or in dual channel

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