Why does not my computer running Windows® see the full 4GB of memory capacity?

Why does not my computer running Windows® see the full 4GB of memory capacity? The highest memory capacities supported by operating systems; 

The limitation of the memory capacity of your system is due to two different causes. The first is the memory capacity that your motherboard can support, and the second is the memory capacity limit that your operating system can support.
For example, if you install a 32-bit Windows operating system (all Windows operating systems intended for end users are 32-bit unless otherwise specified as 64-bit), and your motherboard supports 4GB of memory, your operating system will see 3 – It will use. You might think that this is an error caused by the memory module.
However, this is not a memory module error. Windows can address 4GB of memory, but that does not mean 4GB of physical memory.

Why only a certain part of the addressed memory is visible? Some of the memory is being used for files, such as video card, PCI card, ethernet card, etc. may be used by components.
The amount of memory to be used by the devices in the system is calculated when the system is turned on. If your system memory is not at its highest capacity, your operating system does not report this value to the user and indicates that all physical memory (all installed module capacity) is available. However, when you increase your system memory to its maximum capacity, your operating system will display the amount of memory used by the components, falling from the system memory, to the user. For this reason, the user can not use the entire system memory, and although the total memory on the motherboard is 4GB, the amount of memory that can be used is 3.5GB per board.
Supported high memory sizes differ from operating systems. For example, 64-bit Windows operating systems do not have a 4GB limit.

The highest memory capacities supported by operating systems;

Microsoft Windows operating systems:
· Windows 95: 1GB
· Windows 98: 1GB
· Windows 98SE: 1GB
· Windows ME: 1.5 GB
· Windows NT®: 4 GB
· Windows 2000 Professional: 4 GB
· Windows 2000 Server®: 4 GB
· Windows 2000 Advanced Server: 8GB with PAE enabled
· Windows 2000 Datacenter Server: 32GB with PAE enabled
· Windows XP Home: 4GB
· Windows XP Professional: 4GB
· Windows XP 32-bit: 4GB
· Windows XP 64-bit: 128GB
· Windows Vista ™ Home Basic: 4GB
· Windows Vista Home Basic 64-bit: 8GB
· Windows Vista Home Premium: 4GB
· Windows Vista Home Premium 64-bit: 16GB
· Windows Vista Ultimate: 4GB
· Windows Vista Ultimate 64-bit: 128GB +
· Windows Vista 32-bit: 4GB
· Windows Vista 64-bit: 128GB +
· Windows Vista Business: 4GB
· Windows Vista Business 64-bit: 128GB +
· Windows Vista Enterprise: 4GB
· Windows Vista Enterprise 64-bit: 128GB +
· Windows Server 2003: 4 GB
· Windows Server 2003 Enterprise Edition SP2: 64 GB
· Windows Server 2003 Datacenter Edition SP2: 128 GB
· Windows Server 2003 64-bit: 4 GB
· Windows Server 2003 Enterprise Edition SP2 64-bit: 2 TB
· Windows Server 2003 Datacenter Edition SP2 64-bit: 2 TB
· Windows Server 2008: 4 GB
· Windows Server 2008 Enterprise Edition: 32 GB
· Windows Server 2008 Datacenter Edition: 64 GB
· Windows Server 2008 64-bit: 32GB
· Windows Server 2008 Enterprise Edition 64-bit: 2 TB
· Windows Server 2008 Datacenter Edition 64-bit: 2 TB

Linux and Mac® OS operating systems;
· Mac® OS X Panther ™, Tiger ™, and Leopard ™: All three Apple operating systems have a 4GB operating system memory capacity limit. In fact, since all three systems are 64-bit, the memory capacity limit values ​​are like 4TB per 2TB not end user. Also, on Mac systems, the memory limit is more from the motherboard than from the operating system.
· Mac OS 9.x: 1.5GB (The maximum amount of memory that can be allocated to an application is 1GB.)
· Red Hat Linux 2.4 kernel: 64GB

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