Maximum Addressable Memory (RAM) of Different Operating Systems

[CPU Brand ang gamit mo]

CPU Brand ang gamit mo
AMD(Advanced Micro Devices)
	29 (37%)
Intel
	46 (59%)
Cyrix
	0 (0%)
Others not mentioned
	2 (2%)
Total Voters: 77

[darkangel]

Windows XP Starter Edition: 512 MB
Windows XP Home and Professional 32-bit: 4GB (but will register 3.25gb as some portion of memory are allocated for the system.)
Windows XP Pro 64-bit: 128 GB

32-bit Windows Vista Starter: 1GB
32-bit versions of Windows Vista Home Basic, Home Premium, Business, Enterprise, and Ultimate: 4GB
64-bit versions of Windows Vista Home Basic: 8GB
64-bit versions of Windows Vista Home Premium: 16GB
64-bit versions of Windows Vista Business, Enterprise, and Ultimate: 128GB

32-bit versions of Linux, Debian: 1gb (could be tweaked to use 4gb to 64gb using Physical Address Extension (PAE))
32-bit Ubuntu version 6.10 upwards: 4gb
64-bit versions of Linux. 64TB

Server (32-bit):
2000 Advanced:    8 GB with PAE, 4GB without
2000 Datacenter:    32 GB with PAE, 4GB without
2003 Enterprise Edition:    32 GB with PAE, 4GB without
2003 R2 (or SP1) Enterprise Edition:    64 GB with PAE, 4GB without
2003 Datacenter Edition:    64 GB with PAE, 4GB without
2003 Standard Edition:    4 GB
2008 Enterprise or Datacenter Edition:    64 GB with PAE, 4GB without
2008 other editions:    4 GB

Server (64-bit):
2003 SP2 Datacenter Edition:    2 TB
2003 SP2 Enterprise Edition:    2 TB
2003 R2/SP1 Datacenter Edition:    1 TB
2003 R2 Enterprise Edition:    1 TB
2003 SP1 Enterprise Edition:    1 TB
2003 R2 Standard Edition:    32 GB
2003 Standard Edition SP1:    32 GB
2003 Datacenter Edition:    512 GB
2003 Enterprise Edition:    64 GB
2003 Standard Edition:    16 GB
2008 Datacenter:    2TB
2008 Enterprise:    2TB
2008 Standard:    32GB
2008 for Itanium-Based Systems:    2TB
Windows Web Server 2008:    32GB

sources:

http://www.xpfree.org/os_system_ram_limitations_guide.htm
http://www.dansdata.com/askdan00015.htm
http://www.mydigitallife.info/2007/01/14/windows-vista-32-bit-and-64-bit-x86-and-x64-maximum-supported-ram-physical-memory-limit/
http://en.wikipedia.org/wiki/Physical_Address_Extension
http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx
http://www.memorydeal.net/physical-memory-limits-windows-server.php
http://msdn.microsoft.com/en-us/library/aa366778.aspx#physical_memory_limits_windows_vista
http://msdn.microsoft.com/en-us/library/aa366778.aspx#physical_memory_limits_windows_xp

[draw_paintatoms]

Thanks bro dark! I will bookmark this page for reference. 
Many are asking why aren't they seeing a 4gb RAM after they installed 4GB on their Windows XP Pro 32bit. This explains why.

64-bit versions of Windows Vista Business, Enterprise, and Ultimate: 128GB

Can't imagine what I can do with this size of memory!   

[ftracena]

yup , but with currently available memory in market is only 4gb ram module, i think maybe a couple of more years, you can slot a 32gb ddr ram to [txtspk] mobo, (x4 pa so that makes it 128gb) think how powerful a 64bit pc's will become...wew

[deboned]

wow with 128GB of memory you forget and remove the pagefile.