4GB of RAM installed in the bios but only 2GB enabled

Oct 11, 2018
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I have windows 8.1(64 bit) installed in my computer which shows 1.92GB usable the bios shows installed size 4GB but enabled size is 2GB

Motherboard : Gigabyte F2A68HM-S1

Processor : AMD A4-4020 APU

64 bit Operating System

My BIOS does not have any memory remapping feature and I have tried changing the memory slots.

Please help me.