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Non-usable RAM

sfedis
By sfedis
in Troubleshooting
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Hello, I have a 990FXA-GD65 (MS-7640) mobo and i used to have 4GB RAM. I decided to make an upgrade to 8GB and i bought the same 4GB RAM i had but for some reason i can not use it (Windows system says i have 8GB but 3.97 usable CPU-Z says i have 8GB but single channel). Can someone help?

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https://linustechtips.com/topic/803644-non-usable-ram/
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Are you using a 32-bit or 64-bit operating system?

Main System: Phobos

AMD Ryzen 7 2700 (8C/16T), ASRock B450 Steel Legend, 16GB G.SKILL Aegis DDR4 3000MHz, AMD Radeon RX 570 4GB (XFX), 960GB Crucial M500, 2TB Seagate BarraCuda, Windows 10 Pro for Workstations/macOS Catalina

 

Secondary System: York

Intel Core i7-2600 (4C/8T), ASUS P8Z68-V/GEN3, 16GB GEIL Enhance Corsa DDR3 1600MHz, Zotac GeForce GTX 550 Ti 1GB, 240GB ADATA Ultimate SU650, Windows 10 Pro for Workstations

 

Older File Server: Yet to be named

Intel Pentium 4 HT (1C/2T), Intel D865GBF, 3GB DDR 400MHz, ATI Radeon HD 4650 1GB (HIS), 80GB WD Caviar, 320GB Hitachi Deskstar, Windows XP Pro SP3, Windows Server 2003 R2

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https://linustechtips.com/topic/803644-non-usable-ram/#findComment-10101979
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3.97GB is a common indicator that you are using a 32-bit OS.  You will probably have to re-install your OS as a 64-bit version.  If you want to save your profile and many settings, Go to C:\Users, and copy your user profile to another drive.  Re-install the OS as 64-bit version.  After you login to the new OS, and install your drivers, you can go to C:\Users and overwrite the profile with your old profile that you saved.  You WILL have to re-install any additional apps or programs.  

 

To verify if you have a 64-bit OS, go to: Control Panel\System and Security\System
post the screen shot of the window.

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