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[info] Windows 7 usable memory less than physically installed memory - i4memory.com - different look at memory
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Old 09-08-2010, 12:25 AM   #1
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[info] Windows 7 usable memory less than physically installed memory

Windows 7 users who notice max usable memory size is less than physically installed memory amount. The reasons for this are explained here http://support.microsoft.com/kb/978610/en-us

On a computer that is running Windows 7, the usable memory (RAM) may be less than the installed memory.

For example, a 32-bit version of Windows 7 may report that there is only 3.5 GB of usable system memory on a computer that has 4 GB of memory installed.

Or, a 64-bit version of Windows 7 may report that there is only 7.1 GB of usable system memory on a computer that has 8 GB of memory installed.

Note The amount of usable memory in the examples are not exact amounts. Usable memory is a calculated amount of the total physical memory minus "hardware reserved" memory.

To view the installed memory and the usable memory in Windows 7, follow these steps:

1. Click Start button, right-click Computer, and then click Properties.
2. View the Installed memory (RAM) value under System. For example, if it displays 4.00 GB (3.5 GB usable), this means that you have 3.5 GB of usable memory out of 4 GB of installed memory.

This is expected behavior on computers that are running Windows 7. The reduction in available system memory depends on the configuration of the following:
  • The devices that are installed in the computer and the memory that is reserved by those devices
  • The ability of the motherboard to handle memory
  • The System BIOS version and settings
  • The version of Windows 7 that is installed (For example, Windows 7 Starter Edition only supports 2 GB of installed memory.)
  • Other system settings

For example, if you have a video card that has 256 MB of on-board memory, that memory must be mapped within the first 4 GB of address space. If 4 GB of system memory is already installed, part of that address space must be reserved by the graphics memory mapping. Graphics memory mapping overwrites a part of the system memory. These conditions reduce the total amount of system memory that is available to the operating system.

For more information about how to determine how memory is used on your computer, see the "Physical Memory Allocation in Windows 7" topic in the "More Information" section.
If you're on Intel P55/X58 chipsets there also maybe other reasons for less physical memory installed being reported which differs from less physical memory being usable. You'd need to read and bookmark http://i4memory.com/ramdetect.
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Old 26-08-2010, 07:16 PM   #2
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Example Xeon W3540 + DFI UT X58-T3EH8 with HIS 1GB HD5570 video card


Last edited by eva2000; 06-01-2011 at 01:05 AM.
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Old 21-04-2011, 02:29 AM   #3
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6x2GB - 12GB installed



Also to double check amount installed grab these apps
  1. memtest86+ v4.20 http://www.memtest.org/
  2. cpuz memory tab http://i4memory.com/f79/cpu-z-1-5x-22933/
  3. cpu tweakerhttp://i4memory.com/f79/memset-v4-1-beta-4-cpu-tweaker-v1-5-p55-x58-tweaking-intel-chipset-memory-timings-2868/

and windows taskmanger -> resource monitor memory tab as per above screenshots

Last edited by eva2000; 22-04-2011 at 06:14 AM.
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