Supported Memory Size - Server Operating Systems
The server operating systems built around NT technology have supported memory sizes greater than 4 GB for years now, using a feature called Physical Address Extension (PAE). The compatibility issues that have plagued Windows XP do not exist in the server arena, as the variety of devices and drivers used here is much smaller. Also, the manufacturers are much more conscientious about validating their drivers than is the case in the desktop space.
|Windows Server 2008||32 bit||64 bit|
|Datacenter||64 GB||2 TB|
|Enterprise||64 GB||2 TB|
|Standard||4 GB||32 GB|
|Web Server||4 GB||32 GB|
After its initial launch, Windows Server 2003 was extended and offered as version R2. Additionally, Service Pack 2 is available for the original version, which also increases the amount of supported memory. Thus these versions of the server OS are listed twice in the table below.
|Windows Server 2003||32 bit||64 bit|
|Datacenter SP2||128 GB||2 TB|
|Enterprise SP2||64 GB||2 TB|
|Standard SP1||4 GB||32 GB|
|Datacenter R2||128 GB||1 TB|
|Enterprise R2||64 GB||1 TB|
|Standard R2||4 GB||32 GB|
|Web Edition||4 GB||-|
|Small Business Edition||4 GB||128 GB|
I have 1 GB of RAM and am using 80% after a normal boot (plus a few non-essential apps... but they make doing things easier
Did I miss something?
Nevertheless I've already built a system with Vista 64 & 8GB ram few weeks ago and wanted the test to comfort decisions I made.
Also, is the reason that only 3.5GB is available in the 32-bit environment due to the 512mb video card and MMIO? If so, what will happen in a 32 or 64 bit system if you have a video setup with 2gb of video ram? Will you only have 2GB of main memory available?
Significant chunks of address space below 4GB (the highest address accessible via 32-bit) get reserved for use by system hardware:
• BIOS – including ACPI and legacy video support
• PCI bus including bridges etc.
• PCI Express support will reserve at least 256MB, up to 768MB depending on graphics card installed memory