![]() The /3GB switch can mitigate this to some degree by changing the ratio from 2:2 to 3:1.ĭue to hardware address mapping ( MMIO), some of the address space will be used up by other devices installed (or built-into) the system. There are several different way in which the amount of RAM installed in a 32-bit Windows system can be limited (simplified here):īecause of the way that Windows partitions the address space, programs can only allocate a block of memory up to 2GB in size. I’m wondering if they actually can, and if so, how they manage to do it. I’ve seen some programs (especially RAM-drive software) that purport to being able to access the “unavailable RAM” on 32-bit systems (including XP).
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