MacPro 5GB ram, is it worthy?

Well I have a MacPro 2.66ghz, with 4gb ram
but still I have an extra 1gb but I've never put it on,
will it be great if I put it? like would it make a difference?
will it freeze or something or cause any system/hardware problem?
its a Incognito for me.
thanks for any Help/opinion.

A set of 4 matched DIMMs as
4 x 1GB
4 x 2GB
with the slots 1 and 2 on both Risers filled, is your ideal. Everything else is "topping" on the cake. But the set of four provides the ideal memory bandwidth; symmetrical memory (essential for FCP and for audio and video timing issues).
A pair of 1GB matched DIMMs such as TechWorks, excellent name brand, will set you back $129 and you can find sets for less that are still compatible.
Watch page outs, swap files, and then add extra for overhead and caching.

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