Allocation of memory in Windows Server 2003 Enterprise

Hello

I have installed Windows Server 2003 Enterprise Edition x 86 with 4 GB of RAM in a virtual machine running on ESX

3.5 and the VM shows that 3.75 GB of RAM allocated. He also

Watch he uses physical address Extension.How is possible to get this server to see the full 4 GB of RAM. RegardsDave

Short answer is you can't.  It is based on the Intel Architecture.  It depends on the chipset and other factors, but basically the 32-bit operating system has a limitation in the 4 GB limit.  If Intel has planned no people would use this amount of memory in the x 86 original, therefore that the limitation exists.  Missing memory is tied up in video memory and other things that must be less than the limit of 4 GB.

http://support.Microsoft.com/kb/279151

SYMPTOMS

If you use a computer that has more than 4 gigabytes (GB) of memory installed, system, Microsoft System Diagnostics (WinMSD) properties or other system utilities declare a value of memory which is 256 megabytes (MB) less than the total physical memory that is installed.

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CAUSE

This problem can occur if a server uses the Intel Profusion chipset. In the dead (ROM) computer memory, memory 256 MB high region is reserved for mapped devices in memory of input/output (i/o). The amount of physical memory reserved may increase according to the number of devices of e/s that are installed on the computer. In general, a computer that has 4 gigabytes (GB) of memory real physics looks as if it has 3.84 GB physical memory total.

The Profusion of Intel is a chipset eight-way symmetric multiple processing which is designed for enterprise-level server programs. It focuses on the power of raw processing and IO high speed performance that are commonly found in servers Dell, Compaq, Hewlett-Packard (HP) and 8-way IBM. The amount of memory consumed can be greater than 256 MB; However, the memory increases by increments of 256 MB.

____________________________________________

"The MacBook Pro Core 2 Duo probably uses the Intel 945 PM chipset, which can physically handle the 4 GB of DDR2 RAM. However, a number of items that should be stored in and what RAM reached 4 GB physical RAM space, there are overlaps. In other words, in a configuration 3 GB of RAM, there is no overlap with the ranges of memory required for some features of the system. However, between 3 and 4 GB system memory tries to occupy space that is already assigned to these functions. For example, the allocation of PCI Express RAM occurs at a place about 3.5 GB of RAM and requires 256 MB of RAM. Thus, the virtual space between 3.75 GB of RAM and 3.5 GB of RAM is occupied by the PCI Express data. In a system with 3 GB of RAM, so nothing is wasted because the space required by PCI Express memory is always between 3.5 and 3.75 GB and installed system RAM does not violate this space. The net result is that at least 3 GB of RAM must be fully accessible, so that installing 4 GB of RAM, ~ 700 MB of RAM is bunk critical system functions, making it not addressable by the system. »

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