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windows 2008 R2 usable ram

MarcelZ asked
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?
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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:
What is the machine type, is it compatible with x64 arch.. of windows 2008,, as Cuthbertx says do a bios upgrade...