When upgrading laptop memory, can't the capacity of the two be different?

My laptop memory is 8G, but I don't have enough memory.

I'm using 4G+4G right now.

Is 4G+8G possible?

Or is it just 8G+8G because the capacity should be the same?

I remember seeing a post that said it must be the same to support dual channel(?) before

777 2018-11-03 Gentleman

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