Newly RAM installed 8GB only 3.24 is usuable why?

I have installed 8 GB in total on my home server and it seems to be recognizing it, but on the system properties it says 8 GB (3.24 is usuable). Why this is happening?

I have attempted unchecking the maximum memory check box in the msconfig utility without success.

Any help or guidance will be very much appreciated.

Thanks!
LuiLui77Asked:
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LuiLui77Author Commented:
In the task manager under performance it shows Hardware Reserve 4.6 GB memory, how can I free it?
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
Sounds like a 32bit OS, but 2012 is x64. Or are you using a different Server OS?
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arnoldCommented:
What is the hardware and OS version. How many memory modules are in the system?
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LuiLui77Author Commented:
Its a Pentium D x64 is kind of a clone, it has server 2012 x64 that I just installed now
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arnoldCommented:
What HW is I use, the?

A cone? Is this a VM?

Does the graphics controller consume the shared 4GB?

You've provided no details on how it is setup, configured.

What HW is it, you may have not placed the ram in the correct order/slot.....or the slots you have the modules do not match the memory HW type I.e, ecc versus optimized, mirrored.......
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Gary CaseRetiredCommented:
You've installed this on a 10-year old processor (Pentium-D), which implies you're also using a rather old chipset.

What's the specific motherboard make/model you're using?   ... and what BIOS version is currently installed?

You may have a parameter set incorrectly in the BIOS or may just need a BIOS upgrade.
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LuiLui77Author Commented:
Thank you Gary case, my motherboard just supported a max of 4GB.
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