3 channel memory, can I mix and match?

Kevin_Dos

Reputable
Oct 13, 2015
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4,510
looking to take advantage of some black Friday sales for a budget upgrade. Currently have 3x2GB sticks filling the blue ram slots. I know mixing and matching within the channel isn't recommended but can I fill the 3 white slots with something different?
what would happen if I only add 2 sticks instead of 3? I'm not seeing a lot of 3x kits available, all 2x or 4x is triple channel just not used anymore?

MB is a gigabyte GA-X58A-UD3R
RAM Kingston hyperX