Win7 64 bit upgrade - only shows 3.12GB RAM as usable

I recently upgraded to Windows 7 64 bit from Windows XP 32 bit. This was a clean install onto a new SSD.

At the same time, I also upgraded my RAM adding 2 x 2GB to the orignal 2 x 1GB for a total of 6GB.

The system seems to be working properly except that Control Panel > System&Security > System shows:
Installed Memory (RAM) : 6.00GB (3.12GB usable)

Windows Task Manager also shows total Physical Memory as 3199 MB.

BIOS shows 6144MB Total; 896MB Appropriated; 3200MB Available

This seems to be the same limit on RAM as set by 32bit systems. Thinking that a 64bit driver may be missing for my motherboard I tried to check for drivers on the motherboard support disk. The support CD setup program responded: "Support CD does not support this operating system"

Can anyone offer any suggestions on how I can access all of my RAM?

CPU: INTEL core 2 E6600 2.4GHz
Motherboard: ASUS P5W DH Deluxe - BIOS 1602

Thanks in advance for any help on this issue.
5 answers Last reply
More about win7 upgrade shows 12gb usable
  1. Have you checked for the memory remapping feature in the bios, or have you went into msconfig, in the boot tab, advanced options and make sure "maximum memory" is left unchecked. And if none of the above work, perform a bios update, and if that doesn't work, test each stick individually.
  2. The bios sees "6144MB Total". "896MB Appropriated" is set aside for motherboard resources. If you were to add this 896MB to the 3200MB physical available, you'd have your 4GBs that a 32bit system can handle. This means you have an older bios that doesn't support 64bit memory amounts (not likely.) or you need to enable memory remapping. Look for something along those lines in your bios and enable it.
  3. Thanks for the help.
    As you both suggested, I had not enabled the memory remap feature in BIOS.
    Thanks again
  4. So its fixed then?
  5. Hello OPUS,

    Definitely go check the MOBO bios!

    Microsoft does have an official Windows 7 Support Forum located here . It is supported by product specialists as well as engineers and support teams. You may want to check the threads available there for additional assitance and support.

    John M
    Microsoft Windows Client Team
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