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Generally, faster speed RAM will run faster, but will cost more... but 4 GB is sufficient for all the video games out there, but you will need to install 64-bit Vista or Windows 7 in order to take avantage of the 4 GB of RAM or more. Drivers won't be a problem with 64-bit since driver support have improved since Vista... and Vista is currently the only Windows OS that supports 64-bit pretty well until 7 comes out.
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