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Ram dell xps 420

Last response: in Motherboards
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Windows 7 Expert
Motherboard Master

Hi newcomer and welcome to the Tom's hardware forum.

For me, ur question isn't clear.

If u have Vista 32 bits, ur usable RAM will be 3.25GB, independent of the RAM that support the mobo.

When u install the x64 bit OS (Win 7 x64 in ur case), the amount of that usable change to the amount of RAM supported by the mobo. In that case, the x64 bit OS don't have a limit of 4GB of RAM.
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