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Windows 7: 5GB of RAM installed, 3 available.

22 Dec 2010   #11

Windows 7 Professional x64

You should blur out, or remove your key from the screenshot.

My System SpecsSystem Spec
22 Dec 2010   #12

Windows 7 Ultimate x64

Is it possible that 2GB of the RAM could be dedicated to a PCI-e video card? I have an Nvidia 9400GT that is (supposed) to have 512MB of memory.

Hmm. That is weird. If it was a hardware error, my Mac couldn't possibly be having that same problem. The Mac OS side detects 4 GB of RAM where Windows detects 4 but will only use 3.75GB.
My System SpecsSystem Spec
23 Dec 2010   #13

Windows 7 Ultimate x64

Is there perhaps a boot utility that will allow me to remap my memory since my limited HP BIOS will not allow me to do such a thing?

Unfortunately, HP has since discontinued this model of computer and the last BIOS upgrade was available in 2007.

Having only 3GB of memory isn't draining my system's performance, but it is just irking me since I have 5GB of RAM, 2 of which I am unable to use. When I first installed Windows, 5 GB were available, so it could have also been something I installed.

Perhaps going through and reseating all of the RAM would help.

Is it possible for a PCI-e graphics card to suck on the RAM for it's memory? I thought only onboard graphics shared the RAM for video memory.
My System SpecsSystem Spec

23 Dec 2010   #14

Win 7 Pro x64 SP1 OS X Snow Leopard 10.6.7

I think this tutorial from Brink may solve the problem:
My System SpecsSystem Spec
23 Dec 2010   #15

Windows 7 Ultimate x64

Thank you for the tutorial.
Unfortunately, it did not solve the problem. I specified "5120", and then checked "Make all boot settings permanent".

Well, I rebooted. It was still only using 3 GB of RAM, and when I went back to msconfig, it had reverted my "5120" to "1024", like it always does, even though I checked 'permanent' this time.
My System SpecsSystem Spec
23 Dec 2010   #16
Microsoft MVP

Win 7 Ultimate x64

Specs on that HP motherboard (it may have been made by Asus, but it has as much in relation to an Asus retail board as an apple to an orange),

Motherboard Specifications, M2N68-LA (Ivy8) Compaq Presario SR5421F Desktop PC - HP Customer Care (United States - English)

and the memory support,

  • Dual channel memory architecture
  • Two 240-pin DDR2 DIMM sockets
  • Supported DIMM types:
    • PC2-4200 (533 MHz)
    • PC2-5300 (667 MHz)
    • PC2-6400 (800 MHz)
  • Non-ECC memory only, unbuffered
  • Supports 2GB DDR2 DIMMs
  • Supports up to 4 GB*
    • 32 bit PCs cannot address a full 4.0 GB of memory.

Nice that they put the CYA disclaimer in with regards to 32 bit operating systems, but if they have gone and artificially limited the support to only 4 GB as stated then (and I wouldn't put it past them) it could quite possibly be that this,

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

is why you are not getting the full 4 GB available.

The BIOS must support the memory remapping feature. The memory remapping feature allows for the segment of system memory that was previously overwritten by the Peripheral Component Interconnect (PCI) configuration space to be remapped above the 4 GB address line. This feature must be enabled in the BIOS configuration utility on the computer. View your computer product documentation for instructions that explain how to enable this feature. Many consumer-oriented computers may not support the memory remapping feature. No standard terminology is used in documentation or in BIOS configuration utilities for this feature. Therefore, you may have to read the descriptions of the various BIOS configuration settings that are available to determine whether any of the settings enable the memory remapping feature.
If that is the case not only are you not getting the benefit of 4 GB, but you have 1 GB going to total waste.
My System SpecsSystem Spec
23 Dec 2010   #17

Windows 10 Pro. EFI boot partition, full EFI boot

You are incorrect stormy.

Look at the spec again - the HP outer one for the whole system - and it says it supports up to 8GB RAM with a 64 bit OS and only 4GB with a 32 bit OS. What you quoted above is just a disclaimer for 32 bit OS. The specifications:

My System SpecsSystem Spec
23 Dec 2010   #18

Windows 7 Ultimate x64

Just to get things straight:
I have a 64 bit version of Windows on my computer. I had Windows Vista 64 bit prior to 7. Vista used all 5 GB of RAM. 7 started out using 5 GB and later moved to 3.
My System SpecsSystem Spec
28 Dec 2010   #19

Windows 7 Ultimate x64

One thing that concerns me is:
On my desktop PC, Windows 7 Ultimate x64 recognizes 5 GB but will only use 3.
On my MacBook Pro, Windows 7 Ultimate x64 recognizes 4 GB but will only use 3.

My Mac could not possibly be having the same hardware issue as my desktop. I'd hate to re-install Windows and start from scratch, working my way up to see if it is possibly a software issue that could have caused this. :/
My System SpecsSystem Spec
15 Apr 2011   #20

Windows 7 Enterprise N x64

I have exactly the same issue.

I have a Dell Latitude E6400 and just upgrade with 1x4GB for a total of 5GB and windiws7 enterprise N is only recognizing 3.45 GB.

I alreeady tried everything and have no results.

Did you find the solution?
My System SpecsSystem Spec

 5GB of RAM installed, 3 available.

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