Make sure this fits
by entering your model number..
This is a limitation of a 32-bit operating system. In Windows, the Windows memory manager is limited to a 4 GB physical address space. Most of that address space is filled with RAM, but not all of it. Memory-mapped devices (such as your video card) will use some of that physical address space, as will the BIOS ROMs. After all the non-memory devices have had their say, there will be less than 4GB of address space available for RAM below the 4GB physical address boundary. MacOS X Tiger and Leopard are both 64-bit operating systems and will not experience this problem. Neither will 64-bit versions of Windows XP or Vista or Windows 7.
This site does not sell the items directly, by clicking on the link you will visit the relevant amazon page and for each eligible purchase may be awarded a commission to the webmaster. You can also ask questions about specific aspects of the items such as shipping, purchase and anything else directly on the amazon page and not on this one.