This module memory to buy?

I have a Mac Pro (early 2009), frequency of 2.66 GHz Quad Core Intel Xeon.  Currently I have 3 GB of memory (three 1 GB modules) and there are increasing.  Can I buy a 4GB module (if I can't find those 2 GB online), and my question is: is a 4GB module in my Mac, sharing space with the three modules of 1 GB, works fine?  Thank you.

You can look at some of the sites such as OWC or critical

http://eShop.MacSales.com/MyOWC/

https://www.crucial.com

Find your model and see their recommendations

Tags: Mac

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