desktop memory

I am getting ready to place new memory into my desktop computer.  Currently I have 2 sticks of 512MB in it.  I have two open slots and am installing 2 additional sticks of 1GB each.  The question is, do I need to remove the 512MB sticks before installing the new 1GB sticks?
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no.. you can use them together... the case in here is thair frequency.. I think you obtain the new ram modules compatable with your board fsb speed and also your ald 512 MB block have the same parameters tooo

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it is a bit more complicated than said above.
some motherboards (it depends on the manufacturer) can handle different ram models and brands easily; some don't.
My best advise to you is to look what mobo you have, and look on the motherboards manufacturer site to check what memory is supported.
Sorry - but you did not post any info on the mobo, so i can't help you better
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