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Windows 7: 4 GB Installed 2 GB Usable Memory issue.

06 Feb 2010   #11

Windows 7 Professional SP1 - x64 [Non-UEFI Boot]

Quote   Quote: Originally Posted by ctdummy View Post
I just built a PC and installed Windows 7 Home Premium x64. My system shows 4 gigs of ram installed but only 1.99 GB usable. I'm not sure what else I can check here. I'm using an EVGA P55 LE with the latest bios.

Latest Bios
Memory remapping enabled
Check MSCONFIG max memory isn't limited.

I noticed that on EVGAs performance tool the memory is reading as single channel when it should read dual channel.

I'm using a Radeon HD 4890 1GB DDR5
OCZ Low Voltage Platinum PC-10666 Dual Channel 2GBx2 DIMMS

I've been scouring the internet in search of some sort of answer. Please Help!
Force windows 7 to set memory at

5997 to 8143 as you have to set at x1,5 the amount of 4Gb Ram aviable,

In the System Properties tab=> Avanced System Parameters tab=>Performances=>Modidy...

Don't let automatic setting. Don't use any LargeSystemCache in the registry

Anyway, on 4095 ram only 3998 are there, 97 ram amount are reserved for Hardware purpose.

Attached Thumbnails
4 GB Installed 2 GB Usable Memory issue.-grab0000-copie.jpg   4 GB Installed 2 GB Usable Memory issue.-grab0002-copie.jpg  
My System SpecsSystem Spec
06 Feb 2010   #12

Windows 7 Ultimate x64 SP1, Windows 8.1 Pro x64, Windows 10 Pro x64

If you are using Windows 7 x64 then it should show 4GB installed under System especially if memory remap is set, with no mention of usable. It will only show usable if something less than the full amount is usable.
My System SpecsSystem Spec
06 Feb 2010   #13
Microsoft MVP

Win 7 Ultimate x64

What is the total ram it shows in the bios? If it is anything less than 4 GB then the sticks are in the wrong slots (manuals have been getting it wrong from years), or you need to look through the bios to find something to do with memory remapping.
My System SpecsSystem Spec


 4 GB Installed 2 GB Usable Memory issue.

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