which ram slot for 1 stick - Does using dual chanel memory over single affect igpu - Graphics ... rich 888 slot

I want to upgrade the RAM memory of the PC, but i can't find anywhere which of the 4 slots are for dual channel use.

If you have inserted a RAM stick in slot 4 and 1/2/3 it does not boot, and that stick works in slot 1/2/3 and you have inserted it properly it is perfectly possible.

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