The rest is available for other applications and/or is used for the Windows dynamic file and disk cache. For instance, on my 1GB RAM desktop, with a couple of Internet Explorer Windows, Word 2003 beta, Outlook plus sundry drivers and applets running, the Commit Charge hovers around 150-175MB. The Performance tab in the Windows Task Manager gives you a summary of the system memory usage. If you have the time and inclination, once the RAM is installed, take a look at how it is being used by Windows XP. If in doubt, check with your vendor first it could pay to take the system back to the shop, and have the memory installed and tested there. These are more expensive but, for some motherboards, ECC is required in large memory configurations. You also need to ensure that you use the right type of RAM (in some boards, all the modules have to be physically and electrically the same), and perhaps also use Error Correcting and Compensating (ECC) modules.
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