I have recently upgraded a Windows 7 Home Premium PC with 12 GB of RAM. For some reason once I looked in the System tab it said only 7.96 GB of 12 GB of RAM is usable. I have already tried to go into the msconfig to see if the Maximum Memory was ticked, which it wasn't.
Is there a solution to this error? The other topics that I have viewed on Super User did not help me at all.
Installed RAM:
msconfig:
My Windows Edition is showing "Home Premium":
Resource Monitor:
Answer
An image is worth more than thousand words:
Those are your missing 4 GiB of memory. What exactly is using them? The usual suspect is the graphic card (you must consult your manual to check that your card really have/use it's own RAM), integrated graphic card (some motherboard doesn't disable the internal graphic card when you pin a dedicated one, in this case you must disable it manually, or reduce the VRAM usage to the minimum if it's not possible to disable it (a ROM update might be necessary)), the BIOS hiding the memory, using a unsupported RAM configuration, etc.
You can type devmgmt.msc in the start menu to open the Device Manager and check Resources by Connection in the View Menu, and expand the Memory node. This would show exactly what's using the memory (if it's used by hardware) or something else.
Reference:
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