What Are the Advantages?
Why the big push to 64-bit by Microsoft for their server operating systems? Is it just the memory limitations of 32-bit, or are there other, compelling reasons? In our opinion, there are four compelling reasons to use 64-bit for servers: memory, performance, security, and virtualization.
Memory
The 32-bit versions of Windows Server use a flat memory addressing scheme, limiting these versions to a 232 address space. This means a virtual memory address space of only 4 GB, which is divided into 2 GB of virtual memory address space for the operating system and 2 GB of virtual memory address space for applications.
By contrast, 64-bit versions of Windows Server support 16 terabytes of virtual memory address space, divided equally ...
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