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Windows 7: Max usable memory???

30 Apr 2011   #1
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 
Max usable memory???

I just upgraded my memory to Corsair 16GB (4x4GB) Vengeance DDR3-1600 Dual Channel.
My mobo supports 16GB, but it is saying only 8GB is available for use.
Does anyone know how to resolve this so I have all my memory available to use?
Thank you in advance.


My System SpecsSystem Spec
30 Apr 2011   #2
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

hi there

first please check how much ram is allocated

1 > windows key+R

2 > msconfig

3 > click ok

4 > click boot

5 > click advanced

6 > un-check maximum memory if ticked


Attached Thumbnails
-brys-snap-30-april-2011-08h00m24s-01.png  
My System SpecsSystem Spec
30 Apr 2011   #3
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
 
 

I think I found the answer, from you MB users manual:

-mem.jpg

Looks like DDR3-1600 are supported for one DIMM per channel only.

A Guy


My System SpecsSystem Spec
30 Apr 2011   #4
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

second check open resource monitor to see details of memory

1 > windows key+R

2 > type resmon


Attached Thumbnails
-brys-snap-30-april-2011-08h06m17s-02.png  
My System SpecsSystem Spec
30 Apr 2011   #5
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

here ia a good free program to see details of your ram called RAMMon by pasmark

link >>> PassMark RAMMon - Identify RAM type, speed & memory timings

Quote:
RAMMon is an easy to use Windows based application that allows users to quickly retrieve the Serial Presence Detect (SPD) data from their RAM modules. It will allow users to identify a multitude of attributes, of which, includes the manufacturer, the clockspeed and other data of their DDR2, DDR3, XMP and EPP memory devices and even some older memory types. It uses SysInfo DLL SDK to gather the SPD attributes from RAM devices. This information provides a snapshot of the available data for each RAM module installed on the system.

What is SPD?
Serial Presence Detect (SPD) is the standard set forth by JEDEC for a host system to retrieve attributes of memory modules. The SPD standard is intended for use on any memory module, independent of memory technology or module form factor.

RAMMon displays the values stored on RAM module such as the memory capacity, the manufactuer, serial number, model part number, the CAS latencies supported and the module voltage.

Also, depending on your RAM type, other specific SPD data can be retreived as well. Such as the module thickness, module width, maximum operating temperature and more.


Attached Thumbnails
-brys-snap-30-april-2011-08h12m59s-03.png  
My System SpecsSystem Spec
30 Apr 2011   #6
brianzion

Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
 
 

Quote   Quote: Originally Posted by A Guy View Post
I think I found the answer, from you MB users manual:

Attachment 152010

Looks like DDR3-1600 are supported for one DIMM per channel only.

A Guy
good call A Guy
My System SpecsSystem Spec
30 Apr 2011   #7
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 

Explain 1 DIMM per channel?
I previously had DDR3-1600 4x2GB dual channel and had a total of 8GB memory.
Now I have DDR3-1600 4x4GB dual channel and have a total of 16GB, but only 8GB available.
Resmon and CPU-Z both say I have a total of 16GB installed.
My System SpecsSystem Spec
30 Apr 2011   #8
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
 
 

Hmmm, one dimm per channel on a dual channel MB, would mean a total of 2 dimms. This is for X.M.P. and DDR3 1600, according to the manual. But if you had 4 dimms of 1600 working ok before...

Let me do some looking. A Guy
My System SpecsSystem Spec
30 Apr 2011   #9
A Guy

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium x64 SP1
 
 

Find lots of people reporting similar problems, but few fixes. Have a look here:

Asus X58 + 6/12GB memory overclocking - detecting less memory than installed - i4memory.com - different look at memory

Most suggestions have to do with turning off the Auto settings in BIOS and setting the frequency and timings manually. Also suggestions to set the frequency at 1333 and seeing if that helps. What did the resource monitor report as far as ram installed? A Guy
My System SpecsSystem Spec
30 Apr 2011   #10
jebuchanan

Windows 7 Ultimate x64 (Retail)
 
 

as I posted above, Resource Monitor says I have 16GB total RAM installed.
My System SpecsSystem Spec
Reply

 Max usable memory???




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