Always test them before selling. There is a lot more to it than just sticking them in a computer to test them. There are a number of different types of RAM and it can be very confusing for a beginner. I would suggest doing some reading before you experiment with it. RAM testers are available but not worth the cost unless you are testing hundreds of sticks at a time.
I have sold a ton of RAM and only had one stick that the customer said was bad.
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