Comparison 64bit vs 32bit
I notice that for most people, it's still a big question what are the most important differences between 32-bit and 64-bit. I hope this table will help you understand why 64 bit os better, and why it doesn't have to be that more expensive.
| General Memory Limits |
32-bit |
64-bit |
| Total Virtual Address Space |
4 GB |
16 TB |
| Virtual Address Space per 32-bit process |
2GB (3 GB if system is booted with /3gb switch) |
4GB if compiled with /LARGEADDRESSAWARE 2GB otherwise |
| Virtual Address Space per 64-bit process |
Not applicable |
8 TB |
| Paged Pool |
470 MB |
128 GB |
| Non-Paged Pool |
256 MB |
128 GB |
| System PTE |
660 MB - 900 MB |
128 GB |
| Physical Memory and CPU Limits |
32-bit |
64-bit |
| Windows XP Professional |
4 GB / 1-2 CPUs |
32 GB / 1-2 CPUs |
| Windows Server 2003 Standard Edition |
4 GB / 1-4 CPUs |
32 GB / 1-4 CPUs |
| Windows Server 2003 Enterprise Edition |
64 GB / 1-8 CPUs |
1 TB / 1-8 CPUs |
| Windows Server 2003 Datacenter Edition |
64 GB / 1-32 CPUs |
1 TB / 1-64 CPUs |
Source: ePact.