This may be a dumb question but here it is.

I currently run a AMD 64 with 2x256 ddr of ram. I'm looking to upgrade the ram. I know I hold 4 slots. Is it better to go 256x4 or 1 1 gig stick? As well what can i do to improve performance for a java game?

What Operating System do you run?
Also take a look here:
http://crucial.com/systemscanner/loader.aspx?Agree=Yes
Crucial's scanner will scan your system and tell you what you can upgrade to. You can also buy RAM from them or take the information they give you and use it else where.

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