Sep 29, · Windows 7 and Windows Vista 32 bit can use the exact same amount of ram, a 32 bit operation system can only use a certain amount, it may show in your system as the ram is there but anything over 4GB is not being used and cannot being used, I say 4Gb because if you have 4gb in there the OS uses a certain amount and then the bios/OS used a. Jan 13, · As bit Windows may be able to address up to 4GB, an individual process can only use up to 2GB of that space, regardless of how much remains free for use. Using the /3GB switch can increase the amount of RAM avaliable to applications, but does not increase the size of the System Address Space, and will not increase the maximum amount of RAM.
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