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You need to look at your Motherboard's Owners Manual to find this out.
MBs in the past (5+ years or so), had to have the memory slots used in pairs, IE: they didn't have 4 slots, they had two pair slots, and each pair have to have the same memory amount. Between the pairs could be different.)
I've seen more modern MBs that don't have this limitation so I'd guess the limitation would now be rare.
The only way to be sure would be to find your exact make and model and check it's Manual.
You should be able to find the exact model's OM from the manufacturer's website.
If you don't know the answer to this question yourself, you probably don't do enough with your PC where more than 8 gigs will be needed anyways, or be worth the cost given the likely age or specs of your PC based on the lack of information given, so there you are.
tell us the MB model # and someone can tell you for sure. As another poster said, you'll give up dual-channel with one stick changed out.
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