The primary benefit of moving to 64-bit is the increase in the maximum allocatable system memory (RAM). Windows XP 32-bit is limited to a total of 4 GB, which is, by default, equally divided between Kernel and application usage. Using the /3GB switch in the boot.ini file forces Windows to limit the kernel to the upper 1GB and provides up to 3GB for applications. Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 16 exbibytes (16 billion Gibibytes), Windows XP x64 is currently limited to 128 GB of physical memory and 16 TiB of virtual memory. Microsoft claims this limit will be increased as hardware capabilities improve.
این میشه جوابتون:
خلاصه : ویندوز Xp 32bit از چهار گیگ بیشتر نمیتونه ساپورت کنه این مشکل به خاطر اینه که اصولا از این مقدار بیشتر نمی تونه آدرسدهی کنه.





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