FAQs


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Only 3.5GB available with 4 GB RAM installed?

Designed as a 32-bit operating system (OS), Windows XP supports an address range from 0 to 4 GB of physical or virtual memory. Even if a computer is loaded with 2 GB of physical RAM, the OS still has access to 4 GB of virtual memory via disk paging. Physical memory addresses are allocated to manage both the computer’s resources (machine hardware) and RAM. The PCI memory addresses starting down from 4 GB are used for things like the BIOS, IO cards, networking, PCI hubs, bus bridges, PCI-Express, and the largest block of addresses is allocated for graphics cards.

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