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Windows 7: How to make Windows 7 x64 use ALL your Memory!

08 Jul 2009   #1

Windows 7 Ultimate x64 Build 7264
 
 
How to make Windows 7 x64 use ALL your Memory!

Okay, so recently I had a problem with Windows 7 x64 only using 5Gb out of my 6Gb or RAM. I figured it out, and I'll show you what to do if you're having problems.

The first screenshot is what it looked like initially.

How to fix:

1) Go to start menu and search for "msconfig" and hit enter.

2) Go to the "Boot" tab and click on "Advanced Options".

3) Another menu should pop up. From there, you want to uncheck the box that says "Maximum memory"

4) It will ask you to restart your system. Restart it, and when it boots back up, it will use all your memory.

Look at the attachments for more help!



Attached Thumbnails
How to make Windows 7 x64 use ALL your Memory!-ram.jpg   How to make Windows 7 x64 use ALL your Memory!-step1.jpg  
Attached Images
  
My System SpecsSystem Spec
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08 Jul 2009   #2
DJG

 

It would be interesting to understand the significance of both options. I'm very fuzzy on what the ramifications of either option are. Maybe somebody else has some insight?
My System SpecsSystem Spec
08 Jul 2009   #3

 

Quote   Quote: Originally Posted by DJG View Post
It would be interesting to understand the significance of both options. I'm very fuzzy on what the ramifications of either option are. Maybe somebody else has some insight?
See this MSDN article.
My System SpecsSystem Spec
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08 Jul 2009   #4
DJG

 

Quote   Quote: Originally Posted by Antman View Post
Thanks, Antman. It's a good explanation of the boot memory parameters. I was wondering more from a performance / capacity perspective what the impact was, if there is any advantage on having all memory available at boot time which apparently allows it to reserve 1GB to the hardware.

That's how I'm currently configured. Maybe I'll have to bite the bullet one of these days and play around ...
My System SpecsSystem Spec
08 Jul 2009   #5

Windows 7 Ultimate x64 Build 7264
 
 

Quote   Quote: Originally Posted by DJG View Post
Thanks, Antman. It's a good explanation of the boot memory parameters. I was wondering more from a performance / capacity perspective what the impact was, if there is any advantage on having all memory available at boot time which apparently allows it to reserve 1GB to the hardware.

That's how I'm currently configured. Maybe I'll have to bite the bullet one of these days and play around ...

I say go for it. It's an extremely easy tweak and only takes a second.
My System SpecsSystem Spec
08 Jul 2009   #6

 

Quote   Quote: Originally Posted by DJG View Post
...It's a good explanation of the boot memory parameters. I was wondering more from a performance / capacity perspective what the impact was, if there is any advantage on having all memory available at boot time...
You misunderstand the function. This setting is applied at boot time, but is in effect for the current session (all subsequent sessions if unchanged).

Any impact on boot timing relative to this setting, measured by stopwatch or any other process, can only be related to allocation or virtual memory tabulation. Windows will not boot any faster or slower in the mean once the system has its unique minimum memory configuration satisfied. In other words, if a machine is perfectly configured with 4 GB RAM (unique minimum memory configuration satisfied), increasing the physical RAM to 8 GB will not reduce boot time.*

*Given that no other hardware changes are deployed.
My System SpecsSystem Spec
08 Jul 2009   #7

Windows 7 Ultimate 64Bit
 
 

Quote   Quote: Originally Posted by DJG View Post
It would be interesting to understand the significance of both options. I'm very fuzzy on what the ramifications of either option are. Maybe somebody else has some insight?
RAMifications, i like it!
My System SpecsSystem Spec
08 Jul 2009   #8
DJG

 

Quote   Quote: Originally Posted by matt0978 View Post
RAMifications, i like it!
Good one! Dang, I didn't even notice - I'm a poet, and I don't know it!
My System SpecsSystem Spec
08 Jul 2009   #9

XP Pro & Vista Home Premium (x86); Windows Ultimate 7600 x64 Retail
 
 

Quote   Quote: Originally Posted by aero2008 View Post
Okay, so recently I had a problem with Windows 7 x64 only using 5Gb out of my 6Gb or RAM. I figured it out, and I'll show you what to do if you're having problems.
I am more curious as to how your memory usage became restricted to begin with.
My System SpecsSystem Spec
08 Jul 2009   #10

Windows 7 Enterprise x64 SP1, Ubuntu 11.04 x64
 
 

Interesting... My installation of Win 7 x64 RC 7100 already had the Maximum memory box unchecked. Which makes sense actually, since the MSDN article seems to indicate that this box would only be checked to force the OS to use less RAM for testing purposes.
My System SpecsSystem Spec
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 How to make Windows 7 x64 use ALL your Memory!




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