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Windows 7: 4GB installed RAM, 2.75GB usable =[


24 Aug 2009   #1
X7X

Windows 7 x64
 
 
4GB installed RAM, 2.75GB usable =[

Okay, I had this problem with Vista and now again with 7.
And before you ask, yes I have searched the forums but there have always been caveats which make me think that there might be something else.

Now, onto the problem. I have a custom built machine with 4GB of RAM installed. The system is recognising that I have 4GB installed, but it's telling me that I only have 2.75GB usable.

Screenshots attached.

So, shared graphics has far too much memory on tap, and windows can't use more than 2.75GB. Okay I do play games at the highest possible detail, but not that frequently. My graphics card having nearly half my ram all the time is just pointless.
I get that it's shared so it'll only be used if nothing else is using it, but then why does Windows report only 2.75GB usable? The numbers roughly add up to support my thought that it's because of the graphics card.

I've spent several hours today trying to reduce the shared memory but I can't seem to do it. My BIOS allows me to manually set resources (IRQ11-16 I think), but the only two options in are PCI and Reserved. Whatever combination I try, it makes no difference - except for setting them all to reserved which nearly bricked my computer (it froze after POST).
I read that it's because Vista (and presumably 7 too) manage the shared RAM through the WDDM drivers, but I guessed my way through RivaTuner's PowerUser tab and altered stuff to do with system memory, all to no effect.

So firstly, am I right in assuming that only 2.75GB is usable because of the shared ram? If so, how the hell do I reduce that? I don't mind a bit of driver hacking as long as someone can show me how to do it without bricking my computer.

And if it's not because of the shared RAM, what it is? I'm on x64 and it's driving me up the wall!

Any help would be much appreciated, by me and my dear keyboard which at the moment is bearing the grunt of my frustation.




Attached Images
    
My System SpecsSystem Spec
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24 Aug 2009   #2

Windows 7 Pro x64 RTM
 
 

Just installed two sticks of 2GB in my laptop just now and I'm having the same issue

I searched online if my laptops board would support 4GB (Intel 945PM express), some sources said 3 GB max (the laptop originally had a 32-bit processor, but I upgraded to 64-bit) and other sources said 4GB max. I would have at least hoped for 3GB system usage.

I'll play around with it and let you know if I figure anything out.
My System SpecsSystem Spec
24 Aug 2009   #3

Windows 7 Ultimate x64
 
 

Hey guys,

This came up the other day if I recall correctly. Try running msconfig, going to boot, then advanced options and see if the Max memory button is checked. The general consensus was that it should not be. Mine isn't checked and I see all 8 GB available on my system.
My System SpecsSystem Spec
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24 Aug 2009   #4

Windows 7 Pro x64 RTM
 
 

Quote   Quote: Originally Posted by pparks1 View Post
Hey guys,

This came up the other day if I recall correctly. Try running msconfig, going to boot, then advanced options and see if the Max memory button is checked. The general consensus was that it should not be. Mine isn't checked and I see all 8 GB available on my system.
Good thinking, but unfortunately this did not work for me. My BIOS is reporting 2816MB of System Memory, so I'm not sure if it's a limitation with my board. From other posts on this forum, doing a clean install of Windows 7 fixes the problem, but I just spent the last 2 days restoring all my backed up things and I do not feel like going through that again.

Also, from other searches online enabling "Hardware Memory hole" has worked for people with that option in their BIOS, but unfortunately I do not have any memory options in my BIOS.
My System SpecsSystem Spec
24 Aug 2009   #5

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by ath1337 View Post
Good thinking, but unfortunately this did not work for me. My BIOS is reporting 2816MB of System Memory, so I'm not sure if it's a limitation with my board. From other posts on this forum, doing a clean install of Windows 7 fixes the problem, but I just spent the last 2 days restoring all my backed up things and I do not feel like going through that again.

Also, from other searches online enabling "Hardware Memory hole" has worked for people with that option in their BIOS, but unfortunately I do not have any memory options in my BIOS.
If your BIOS is only seeing 2.8GB of RAM...reloading Windows isn't going to fix your problem.
My System SpecsSystem Spec
24 Aug 2009   #6

Windows 7 Pro x64 RTM
 
 

Quote   Quote: Originally Posted by pparks1 View Post
If your BIOS is only seeing 2.8GB of RAM...reloading Windows isn't going to fix your problem.
Yeah that's what I figured... oh well, I guess I just paid $50 for 0.75GBs of RAM
My System SpecsSystem Spec
24 Aug 2009   #7

Win 8 Release candidate 8400
 
 

ATh

Have you checked the max memory in BIOS. It should be unchecked

Ken
My System SpecsSystem Spec
24 Aug 2009   #8

Windows 7 RTM x64
 
 

Just a guess, but do you have a 1GB Video Card in your computer, or perhaps a RAID Controler?

Mia
My System SpecsSystem Spec
24 Aug 2009   #9

Windows 7 Pro x64 RTM
 
 

Quote   Quote: Originally Posted by zigzag3143 View Post
ATh

Have you checked the max memory in BIOS. It should be unchecked

Ken
I don't have any kind of memory options in my BIOS (it's a laptop)

Quote   Quote: Originally Posted by miakayuuki View Post
Just a guess, but do you have a 1GB Video Card in your computer, or perhaps a RAID Controler?

Mia
Nope, my video card is an ati mobility x1600 256MB (Dedicated) 1151 (Shared system memory), no RAID controller that I know of.
My System SpecsSystem Spec
25 Aug 2009   #10
X7X

Windows 7 x64
 
 

Quote   Quote: Originally Posted by pparks1 View Post
Hey guys,

This came up the other day if I recall correctly. Try running msconfig, going to boot, then advanced options and see if the Max memory button is checked. The general consensus was that it should not be. Mine isn't checked and I see all 8 GB available on my system.
Thank you! Task manager and and windows both show 4GB now. BUT, system information is showing 2.88 GB usable, and now my system is sharing even more RAM with graphics! I'll upload screenshots in a minute (I'm typing this on my laptop).
Edit: This number varies - at the moment it's saying 2.12, but a few minutes ago it was 2.17. I figure that's normal, but still very low

Quote   Quote: Originally Posted by miakayuuki View Post
Just a guess, but do you have a 1GB Video Card in your computer, or perhaps a RAID Controler?

Mia
I've got a 512mb 9800GTX and a RAID Controller, but I don't use RAID.


Update: Screenshots attached


Attached Images
  
My System SpecsSystem Spec
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 4GB installed RAM, 2.75GB usable =[




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