Why would a PC display only 7.5 GB of installed RAM if the total physical is 8.0 GB? - Quora
Learn New Things: How to Fix All RAM GB Not Useable Problem in Windows 10/8/7
My laptop has 4GB of RAM and it shows only 3.88GB of usable RAM. Can I install a software that needs 4GB of RAM as minimum requirements in my laptop? - Quora
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windows 7 - I have 4 GB of RAM installed, but why are only 2 GB are usable? - Super User
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windows 10 - 16gb of my 32gb RAM memory is "hardware reserved" and not usable - Super User
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Learn New Things: How to Fix All RAM GB Not Useable Problem in Windows 10/8/7
How to fix: Only 3.25 GB Usable of 8GB Installed RAM. - wintips.org - Windows Tips & How-tos
How to fix "GB usable" RAM problem (Windows 10 x64, Shared Memory, onboard GPU) - YouTube