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I answered a similar question like this not too long ago. Please check the BIOS and ensure it's running the latest.<br />
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Here is the other question thread:<br />
<a href="https://www.experts-exchange.com/questions/26229105/Adding-memory-to-windows-2008-r2-x64.html" rel="ugc">https://www.experts-exchange.com/questions/26229105/Adding-memory-to-windows-2008-r2-x64.html</a>
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I answered a similar question like this not too long ago. Please check the BIOS and ensure it's running the latest.

Here is the other question thread:
https://www.experts-exchange.com/questions/26229105/Adding-memory-to-windows-2008-r2-x64.html [https://www.experts-exchange.com/questions/26229105/Adding-memory-to-windows-2008-r2-x64.html]

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Windows 2008 R2 (64 BIT os) Installed 12 gig ram usable 3,99 ram . &nbsp;How can you use the other 8 gig of ram memory, so that you can use the full 12 gig of ram?
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Windows 2008 R2 (64 BIT os) Installed 12 gig ram usable 3,99 ram .  How can you use the other 8 gig of ram memory, so that you can use the full 12 gig of ram?

windows 2008 R2 usable ram

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.

Components

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.