Do I need to replace old RAM when upgrading?

I have a late-2008 Macbook Pro 15-inch 2.4 GHz Intel Core 2 Duo with 1x 2GB DDR3 RAM card in one of the two slots.  The other slot is empty.  That RAM Card came with the laptop, so it is 7 years old now.  I want to max out the RAM at 4GB.  Can I leave that RAM Card and just buy another 2GB card or is it better to buy 2x brand new 2GB cards?  Or does it not make a difference in performance at all?  Thanks.

A late 2008 15" MBP, model identifier 5.1, can accept up to 8 GB RAM.  I suggest that you install as much as you can if you plan on running Yosemite.
Any combination of RAM modules will work in your MBP, but a matched pair is far the best for maximum performance.
The best sources of Mac compatible RAM are OWC and Crucial.
Ciao.

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