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Windows 7: Full RAM not usable..

03 Sep 2012   #1

Microsoft Windows 7 Professional 64-bit Multiprocessor Free Service Pack 1
Full RAM not usable..

I have recently added to 2GB DDR2 RAM to my PC. But from properties its showing that 4GB RAM installed but out of that only 2GB usable. Any help??

My System SpecsSystem Spec
03 Sep 2012   #2

Windows 7 Ultimate 64 bit

Having looked at your specs...I see you're running 7 32 bit. By default of the 32 bit will only use 3 to 3.5 gigs of RAM no matter how much you install. That's the limitation of the 32 bit OS. To use more RAM, you will need to upgrade to the 64 bit OS.
My System SpecsSystem Spec
05 Sep 2012   #3

Microsoft Windows 7 Professional 64-bit Multiprocessor Free Service Pack 1

Yes I know that 32bit has a capacity to support upto 3.5GB. Anyway I formatted my system. Now its showing 3.2GB usable. Why not full 3.5GB usable??
My System SpecsSystem Spec

05 Sep 2012   #4
Microsoft MVP

Win 7 Ultimate x64

Memory addressing. Everything on and connected to the motherboard, and is taken away from the 4 GB total. Also even if you installed 64 bit Windows you will still get the same amount of memory available as on 32 bit, unless the bios supports memory remapping. Reason being is that the chipset on that motherboard only supports up to 4 GB of ram,

ARK | Intel® Desktop Board DG31PR

which makes it run into this (for Vista but the exact same thing applies to Windows 7),

The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed
My System SpecsSystem Spec
05 Sep 2012   #5

Microsoft Windows 7 Professional 64-bit Multiprocessor Free Service Pack 1

Okay I got it.. Thanks for this info..
My System SpecsSystem Spec

 Full RAM not usable..

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