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Windows 7: Max usable memory???

30 Apr 2011   #11
marsmimar

Microsoft Community Contributor Award Recipient

 
 

Could this possible have something to do with memory mapping?

The usable memory may be less than the installed memory on Windows 7-based computers


My System SpecsSystem Spec
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30 Apr 2011   #12
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 

I have seen this, but, no. BIOS is also reporting only 8GB available

This is the memory I was using.
As you can see, it is dual channel 1600. 2 kits giving me 8GB usable memory.

This is what I currently have installed.
This is also dual channel 1600.

This is the specs on my motherboard.

DDR3 dual channel architecture.
My System SpecsSystem Spec
30 Apr 2011   #13
marsmimar

Microsoft Community Contributor Award Recipient

 
 

Please accept my apologies for these obvious suggestions. Have you tried swapping sticks to different slots? Running them one at a time to rule out bad memory? Do you have the latest BIOS from Asus? Have you tried lowering the memory frequency from 1600 to 1333 just to see if it makes any difference? I agree with A Guy's earlier post. I also found a lot of people reporting the same problem but no real solutions.
My System SpecsSystem Spec
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30 Apr 2011   #14
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 

BIOS 2401, latest version, swapping makes no difference, changing the frequency makes no difference, each DIMM checks out as good on its own. (tried this before you had asked)
My System SpecsSystem Spec
30 Apr 2011   #15
marsmimar

Microsoft Community Contributor Award Recipient

 
 

I hate to leave a problem unsolved but I can't think of anything else you haven't already tried. Only other thing I can suggest is to contact Asus via Technical Inquiry Form or possibly their On Line Service (IM). This may be an issue with 7 not recognizing your available memory rather than a mobo or memory problem. Hopefully Asus has a solution. Or now that it's morning in Canada and the US some of our experts will be waking up with fresh eyes and ideas. Please post back if you find a fix so others can benefit from your aggravation.

ASUSTeK Computer Inc. -Support- Contact us
My System SpecsSystem Spec
30 Apr 2011   #16
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 

I thank you for the response. I have already posted a request with ASUS, both their Tech support and via their Forums.
My System SpecsSystem Spec
30 Apr 2011   #17
marsmimar

Microsoft Community Contributor Award Recipient

 
 

Quote   Quote: Originally Posted by jebuchanan View Post
I thank you for the response. I have already posted a request with ASUS, both their Tech support and via their Forums.
Hopefully they'll have an easy fix and I'll slap my forehead for not thinking of it!
My System SpecsSystem Spec
30 Apr 2011   #18
sygnus21

Windows 10 Pro
 
 

Quote   Quote: Originally Posted by jebuchanan View Post
I thank you for the response. I have already posted a request with ASUS, both their Tech support and via their Forums.
OK, two things.....

Do the modules match?

Also have you checked to make sure the modules are running at their correct voltage?

Manually set the voltages for the modules. I suspect they may not be getting enough voltage, especially if you have the MB "Auto" set the memory. Do this manually and see what happens.

And yeah, according to the article a guy posted, you may have to drop your frequencies. Disable XMP (if enabled) and drop your frequencies to 1066MHz. You may be overloading your memory controller with all that RAM running at (trying to run at) 1600MHz.

That note is basically saying the memory controllers can't handle all that memory at those high speeds.

Let me know.
My System SpecsSystem Spec
01 May 2011   #19
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 

All modules match, and voltages and timings are set correctly (all settings manually done, not Auto). XMP disabled, and dropping the frequency made no difference.
I am going to order 2 8GB kits of RipJaw 1333 memory as that should resolve the problem.
Thank you for your responses.
My System SpecsSystem Spec
01 May 2011   #20
sygnus21

Windows 10 Pro
 
 

If the board is limited to a certain amount of memory at a certain speed, no matter what brand you put in, it's not going to overcome the limit placed by the MB manufacturer.

What you might want to do is see if there is a BIOS update that addresses/fixes the issue first.... instead of spending more money.

My two cents.
My System SpecsSystem Spec
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 Max usable memory???




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