Solved How can I make use of all 4GB RAM in Win 7?

July 19, 2010 at 17:35:30
Specs: Windows 7, amd 64/3800 x2 dual core

I have 4 gb of RAM in my MOBO, and I thought that, now that I"m on windows 7, I'd be able to read all 4, but it still only reads 3gb.

How can I make use of all my RAM?

Cheers


See More: How can I make use of all 4GB RAM in Win 7?

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✔ Best Answer
July 22, 2010 at 20:49:40

The M/B is AMD socket 939 board made in late 2004/early 2005. It has DDR 400/PC3200 RAM modules.

Pls refer to this document and this document for further info on RAM usage.

Therefore, as I understand from the Asus document, this is your M/B limitation. Pls see this and this MS KB Article.

CoolGuy



#1
July 19, 2010 at 18:07:05

First of all, you need a 64-bit version of Windows 7. Second, your motherboard needs a 48-bit or 64-bit chipset. Third, your BIOS has to support 64-bit memory mapping and it may need to be manually enabled.

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#2
July 19, 2010 at 19:34:13

There is kind of a catch 22 deal on 4G. If your system does support fully 64 bit and you do install it you actually end up loosing ram even though you could be able to use a small part of it.

I support the 'Everybody Draw Mohammed Day'. A religion doesn't deny my freedom.


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#3
July 19, 2010 at 22:44:12

First please check if there is a "Memory Remap Feature" setting in BIOS and it is enabled.

Secondly, open cmd with Admin Rights and give the following command:

bcdedit /set pae ForceEnable

Note there is a blank space before the slash and between words.

Restart your PC for the changes to take effect.

Please post back results.

CoolGuy


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Related Solutions

#4
July 20, 2010 at 00:05:32

1. It looks like Memory Remapping was already enabled
2. A DOS screen popped up and disappeared and so I assume I entered the command right.

After restart, nada. I have 4gb installed, but 3gb available memory. If Idisjunction is right I probably need a 64-bit version of windows 7, eh?


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#5
July 20, 2010 at 00:10:25

Did you open the cmd with "Run as admin" credentials ? If not, the command cannot be run.

For further information, see this

CoolGuy


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#6
July 20, 2010 at 05:21:50

Are you using integrated graphics? If so, at least some of the missing RAM is dedicated to the graphics.

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#7
July 21, 2010 at 10:26:05

To othehill and suatcini:

1. I do have admin privilege, yes
2. No, I have a graphics card, not integrated graphics. Plus....it specifies 3gb "total physical memory", denoting that it draws on 3gb, not 4, making it irrelevant what the balance of usage is.


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#8
July 21, 2010 at 10:32:58

Where are you reading that?

Go to Control panel> system, and see how much RAM is installed.

If that reads 3GB, then post the full model of your motherboard and all the individual RAM sticks you hae installed.


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#9
July 21, 2010 at 11:37:25

If you are using a 32 bit OS you do not want to enable memory remapping. This will map memory that is inaccessible to a physical address above 4GB where it can be theoretically accessed with the PAE kernel. The problem is that this only works with a server OS. Memory remapping is only useful with a 64 bit OS or a 32 bit server OS. PAE does nothing useful on a client OS and is not supported or needed with a 64 bit OS.

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#10
July 21, 2010 at 12:17:41

Otehill:

installed memory: 4gb
Total physical memory: 3gb

---according to system info


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#11
July 21, 2010 at 13:13:46

Please read THIS.

i_Xp/Vista/W7User


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#12
July 21, 2010 at 14:24:36

I asked you to post the motherboard model and the number and size of every RAM stick.

If you don't know that information then download SIW from the link below. SIW should yield that information.

http://www.gtopala.com/siw-download...


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#13
July 21, 2010 at 19:45:33

And make sure that you have 64bit OS installed!!!!

You have to be a little bit crazy to keep you from going insane.
If all else fails, read instructions.


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#14
July 22, 2010 at 03:23:07

Response 4 from the OP implies he only has Win7 32bit so there's no way he will be able to make use of the full 4Gb.

"I've always been mad, I know I've been mad, like the most of us..."


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#15
July 22, 2010 at 06:48:10

"How can I make use of all 4GB RAM in Win 7?"

With a 32 bit client OS the simple answer is - YOU CAN'T.

PAE will avail you nothing.
Memory remapping will avail you nothing, it may actually lose some memory.

This is really a hardware limitation, not a problem with Windows.
To make use of all 4GB RAM you MUST use a 64 bit OS.


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#16
July 22, 2010 at 07:04:55

I requested the information in #8 on the off chance that some of the RAM is not being read. Three GB is very low for a rig not using integrated graphics.

The build I am currently on has Integrated graphics and I still have 3.5GB usable of the 4GB installed.


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#17
July 22, 2010 at 08:33:06

OtheHill, you are correct. We do not know if the OP has one 4 GB stick or 2 + 1 + 1 GB combination or 2 + 2 GB combination. If 2 + 1 + 1 combination and you use wrong slots on the M/B, you lose GB.

In my M/B which has A1, A2, B1, and B2 RAM slots, if I use slot A1, A2, and B2, I lose what I install in B2 because my M/B is not able to read B2 unless B1 is populated. If I use slot A1, A2, and B1, all my RAM is readable. This is M/B limitation. I use Asus P7P55D.

I hope this gives OP some hint.

CoolGuy


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#18
July 22, 2010 at 12:44:33

My RAM is-
1-1-1-1
1gb, four slots, all corsair xms, in an Asus A8NE mobo. The bottom line, I think, is I don't have a 64 bit os, and I'm not going to change to one. I feel like I wasted my money in upgrading from 2gb to 4gb. Oh well.

I appreciate all the help from you guys.

cheers!


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#19
July 22, 2010 at 12:52:56

What is 1-1-1-1?

Use SIW like I mentioned in #12. Post the motherboard model and all the information on the memory (RAM).


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#20
July 22, 2010 at 20:49:40
✔ Best Answer

The M/B is AMD socket 939 board made in late 2004/early 2005. It has DDR 400/PC3200 RAM modules.

Pls refer to this document and this document for further info on RAM usage.

Therefore, as I understand from the Asus document, this is your M/B limitation. Pls see this and this MS KB Article.

CoolGuy


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