![]() Most software today is written and optimized for 32 bit architecture. Memory (RAM) will get what is left over, and it is this is what takes usable memory in a 32 bit system from 4Gb of RAM to around 3.25Gb. Because the address space is limited, the more hardware you have, the more space is required to address them. Each device in the system is assigned an address, which takes some of this space. The big difference between 32 bit systems and 64 bit systems is the “Addressable Space”. The limit on 32 bit is 4Gb of RAM, whereas a 64 bit operating system (OS) can use up to 8Tb (128 in 64 bit Vista, and 192Gb in Windows 7). ![]() The most obvious difference between 32 bit and 64 bit is the amount of RAM the system can use. ![]()
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