Can you add memory to a 2.4 GHz Intel Core 2 Duo processor? add if so, how much does it cost and how much faster does it make it?

Would upgrading the RAM in a 2008 macbook be cost effective at this point in time as it also needs a DVD replacement? If yes, what are my options for upgrading the Ram with prices. Thank you for your time!

Apple Memory Module 4GB 1066MHz DDR3 ECC 1x4GB

Apple Memory Module 4GB 1066MHz DDR3 ECC 1x4GB

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