RAM upgrade - add or replace?


Looking to buy 2 RAM sticks. I think my Z-170 Gaming 5 motherboard allows for four RAM sticks and I already have two in there that add up to 16 GB. If possible, can I add two sticks of 16 GB so that I would have a total of 32, or if my motherboard only accepts two sticks, should I replace the old ones with two sticks of 32 GB?

Sorry if the question is confusing, English is not my first language.


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