a515-46-r3ub -> 20gb RAM, but only 3.44GB usable

danielcarlock
danielcarlock Member Posts: 3 New User
recently i buy a aspire a515-46-r3ub on amazon with 20gb RAM, but only 3.44GB usable. I think its because shared with video-ram but in BIOS cannot change the amount of shared memory. what can i do to use whole memory? Images attached

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