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64-Bit Windows 7 Shows 2.75GB Usable Ram out of 4GB

Last response: in Windows 7
July 27, 2009 1:14:47 AM

I recently installed Windows 7 64-bit build 7600
and when I go into control panel, it shows that I have 4 GB installed
but 2.75 is usable....

does anyone have any answers

and yes its 64-bit for sure
July 27, 2009 1:37:17 AM

does it show 4 gig in the bios?
July 27, 2009 1:57:37 AM

cjdutil said:
does it show 4 gig in the bios?

yes it does
it showed 4GB with my old Vista 64bit also
Related resources
July 28, 2009 7:43:53 PM

Is 1.25 being set aside for onboard graphics, perhaps? Eventhough I have a separate video card on my Win7 setup, I still had to disable the onboard graphics sharing my RAM.
July 28, 2009 8:49:35 PM

I have a dedicated video card
The GTX 295 1792MB GDDR3
July 28, 2009 9:06:29 PM

weird. someone have an answer. im really curious.
a b $ Windows 7
July 28, 2009 9:17:59 PM

any memory extension settings in bios? had similar issue with 6Gb being shown as 4Gb in bios and less in windows 64bit. PAE extension rings a bell.
July 29, 2009 4:53:36 AM

nope, no changed memory extension in the bios
a c 209 $ Windows 7
July 29, 2009 6:35:37 AM

TerminatorXT said:
...when I go into control panel, it shows that I have 4 GB installed but 2.75 is usable....
What exactly is it that you're looking at in Control Panel that shows you this?
July 29, 2009 6:36:16 AM

Control panel> System
a b $ Windows 7
July 29, 2009 2:27:29 PM

So windows is using 1.25 Gb of memory.
And you have left 2.75 Gb.

I dont find that strange at all to be honest, I have 4Gb.
And 2.71 of free memory left after windows has loaded in.

Dont see the problem.

July 29, 2009 5:50:42 PM

then why does it show 45% ram running nothing except for the sidebar???
a c 209 $ Windows 7
July 29, 2009 7:27:11 PM

TerminatorXT said:
Control panel> System
OK, so this is where you're seeing it then, right?

And for "Installed memory (RAM)" it shows "4.0GB, 2.75GB usable by Windows"? Is that exactly what it says?

I've never seen that except under a 32-bit OS with more than 2GB of memory. Are you sure that it says "64-bit Operating System" beside "System type:" as shown in the picture above?
July 29, 2009 7:39:29 PM

100% sure its 64-bit Operating systtem
a c 209 $ Windows 7
July 29, 2009 8:40:01 PM

Well I dunno then...
July 29, 2009 8:56:03 PM

should a reinstall work

and if it does i''m probably not going to reinstall right now
July 30, 2009 1:49:41 AM

Probably a brand name computer. They reserve system RAM because of the video card (textures).. you would probably have more available RAM if you removed it and used the on-board (if you have one). They do that for some reason.. with no way to turn it off in the BIOS (being a brand name if it is). Friend of mine had that with a Dell Dimension. He was pissed too. Calling Dell was worthless...
July 30, 2009 4:39:51 AM

I build my computer from the ground up.....

Striker II Extreme
4GB DDR3 1375
GTX 295
1TB Hard drive
July 30, 2009 11:24:01 AM

TerminatorXT said:
I recently installed Windows 7 64-bit build 7600

Seeing as build 7100 is the latest officially released one, I'm wondering if you've downloaded a hacked 32-bit build. Maybe full of trojans too.

July 30, 2009 12:32:35 PM

Wait I think I may have an idea

I know this is stupid and all but just hear me out

Every computer needs an antivirus, and I installed one
Norton v3

for those of you unfamiliar with Norton
its only for 32bit....

soo I'm guessing that.... Norton might be the cause???
July 30, 2009 12:50:48 PM

Norton may be the cause of many ills, but I've never heard of it restricting RAM.

BTW, are there two Program Files directories, one of which is for x86 (or it might read 32bit - I can't get to my x64 Windows 7 ATM to confirm)? If not, then you have a 32-bit Windows 7.

Anyway, the only sure way to get rid of Norton is to re-install the OS. Even the removal tools for it still leave stubs of Symantec stuff lying around. Try something like AVG from instead.

August 14, 2009 9:51:51 PM

My motherboard reserved some memory for PCI ports, or something like that. I had the same problem you're having, but I enabled an option in the bios to extend memory mapping beyond PCI. Hopefully you can do something like that to fix your problem.
August 15, 2009 3:14:04 AM

Well I think we should just drop this

cause I'm not going to install Windows 7 until its released... so i'm not even going to use it

thanks for the input
August 15, 2009 7:17:13 AM

yep. same here.
installed 4GB of RAM and W7 64bit also shows 2.75GB only.
my W7 Build 7100 RC is officially downloaded from MS website.
BIOS shows 4GB RAM installed.
August 15, 2009 7:18:06 AM

jeph22 said:
yep. same here.
installed 4GB of RAM and W7 64bit also shows 2.75GB only.
my W7 Build 7100 RC is officially downloaded from MS website.
BIOS shows 4GB RAM installed.

use any 32bit programs we should know about?
August 17, 2009 1:13:39 PM

Hey, I'm having the same issue but the available for me is different. I have a Toshiba laptop A305D-S6848 which originally came with 3 GB of Ram. Since then i've added another 1GB for a total of 4.

Up until this past weekend, I was running Vista x64 and it reported 4GB ram. This weekend however, I installed Windows 7 x64 and it reports 4GB Ram but only 3.87 GB usable.

I also have a desktop machine with 8GB Ram and it didn't specify whether or not some or all of the Ram was being used so i assumed that 100% is usable.

NOW, another thing i noticed is whenever i do a fresh install, i always give the OS the satisfaction of creating it's own partition, doing this in Windows 7 however, it also created a smaller 100MB partition for system resources. I'm under the assumption that if you don't allow Windows 7 to create this seperate partition, it will seperate a section of Ram for this. If this is the case however, then both the partition and the Ram have been seperated for the system. Again, this is just a theory, I could be completely wrong...

a b $ Windows 7
October 6, 2009 1:34:12 AM

Enable memory remapping in the bio's. That should fix your problem
October 8, 2009 1:31:10 AM

I have build 7100, it show all 8gb of my ram, but has my 1gb card at 4gb in dxdaig
a b $ Windows 7
November 4, 2009 10:14:09 AM

If you use START ->All Programmes -> Accessories ->System Tools - > Resource Monitor ->Memory (Tab) Then a colour bar-chart and breakdown of all system memory is presented. Each section has an explanatory "bubble" if you hover over it (or the legend).

This should explain whether memory is seen or not, and how it is allocated.

If I use a dedicated graphics card with its own memory on my system (MSI DKA790gx), then only 2mb is shown as hardware reserved.

With an activated integrated graphics chip on the same system and no dedicated graphics card, the "Hardware Reserved" memory will include your video memory as well as other bits and pieces.

On my system I was able to allocate 512mb, but 770mb is shown as hardware reserved.

I guess the 50% additional hardware reserved memory is for internal additional video processing, but I'm not sure.

Another way to get to the bar chart is - right click the taskbar, choose "Start Task Manager", select the "Performance" tab and then the "Resource Monitor" button at the bottom of the window and then the "Memory" tab as before.