A1 and B1 memory slots don't work, while A2 and B2 do

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In theory, yes, you can mix different sizes of memory as long as they are the same type and the motherboard supports the

ddr4 slot vs ddr5 As noted already, DDR5 uses a different operating voltage than DDR4, has a different architecture, and has the key slot in a different location

ddr4 in ddr5 slot This is why newer chip sets for DDR RAM provide extended possibilities for DDR, DDR2, DDR3, DDR4 and DDR5 systems such as the Dual Channel (