Windows 7 x64 Ultimate is only seeing 4 GB of the 6 GB installed memory

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Windows only sees 4 GB of memory:

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And yet 6 GB are installed:

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Why? What can I do to troubleshoot the problem?


  • Motherboard: ASUS P7P55D
  • Video card: Radeon HD 4890
  • Power Supply: 630W


you need to refresh you windows experience index. Try that, and see if it updates.

You can also see if the task manger is showing the correct amount memory.

Prese Ctrl+Shift+Esc and the task bar will be brought up. Select the properties tab and then look to see if the correct amount of memory is being displayed.


There are two things that seem to prevent Windows from seeing the full amount of memory of the system. The first is when Windows has somehow limited the amount of memory to be used. To check this:

  • Open msconfig (press the windows key, type in msconfig and then enter) and go to the boot tab.

  • Click the advanced tab and make sure that the maximum memory box is unchecked

The other thing that can cause this issue is a lack of power from the power supply. If you a dignificant amount of ram, multiple video cards, or even just one high end GPU, a high end CPU, mulitple hard drives, then a power supply must be a higher end supply. Here is a website that easily calculates what wattage you need for the PC setup you have.

You can also disconnect any unnecessary components of the PC (i.e. Optical Drive; spare hard drives; USB drives; etc.) and then boot the system and see if Windows recognizes the rest of the memory.

I would update your system BIOS if an update is possible/available. The same thing happened to me on my Thinkpad W510.

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