Which slot to use for Boot when using two slots

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A B+M key fits on both, but doesn't always work together with an M slot The SSDs with M key reach a much higher speed than SSDs with a B key

slot, but I am unsure which to use Unfortunately, I made a note of the Serial Numbers on the SSDs but didn't keep track of which one I put where! 8 And heres all info on the : SSD5, 80mm,SATA III,540s Series,480GB All this is very confusing to me,and I`m sorry if I seem difficult In the motherboard

9 masks of fire slot game I forgot to mention, using the chipset usually disables something like a pair of SATA ports or a PCIe x1 slot Check with your motherboard's “an M key slot is compatible with both B+M key SSD and M key SSD ” So again the question is does that M key slot