Amount of RAM also is important. Generally Windows XP is not running that good on 256M PC and Windows 2000 here has an edge. Windows XP is definitely more resource hungry and on 256K PC it feels slower then Windows 2000. 512K are usually OK and if you have 2G only small amount of this memory is used unless you run some very memory hungry applications. Probably 1G is a good compromise between cost and speed for modern desktops and laptops with XP. You generally do not need 2G for XP and can save money.
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