In BIOS menu, look for a setting named " Memory Remap" or " Memory Hole Mapping"* and set it to Enabled. (The way to enter into BIOS Settings depends on the computer manufacturer).Ģ. Power On your computer and press " DEL" or " F1" or " F2" or " F10" to enter BIOS (CMOS) setup utility. Then look if at the "System Type", displays: 64-bit Operating System).ġ. Ensure that you have installed an 64-bit version of Windows (Right click on "Computer" icon and select "Properties". Ensure with motherboard's vendor, that your motherboard supports over 4GB of RAM.Ģ. Important: Before you continue to the solution below:ġ. How to FIX: Windows detects 3.25 GB RAM when over 4GB are installed. This tutorial contains instruction to resolve the "3,25 GB usable" issue while over 4GB RAM installed on a Windows 64bit OS. After installing Windows 7 (64-bit) and while looking at the System Properties, I realized that the system while properly recognizes the installed memory of 8 GB, says that only the 3,25 GB are usable. Recently I have upgraded the memory from 4GB to 8GB on a system with the AsRock 4Core1600Twins-P35 mainboard.
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