The German computer magazine c't has made a test In general many people believe this 'not usable' RAM In the 32-bit version of Windows 7 from 4 GB usually only 3.25 -3.5 GB of RAM are usable: More dramatically is this lock in the 32-bit version of Windows 7 Starter Edition: There the prohibition is much more rigorous and it only allows access to 2 GB of RAM: The kernel of the 32-bit version of Windows 7 has only a lock, which prevents access to more memory. the 32-bit version of Windows Server 2003, Datacenter Edition supports up to 64 GB of RAM on x86-based computers.
