8.00GB RAM (3.22GB usable) in Windows 7 x64

memory windows-7 64-bit

Enter the BIOS and go to Advanced Chipset Features → North Bridge Configuration, then change the setting Memory Remap Feature to [Enabled].

From the manual:

Memory Remap Feature

This item is used to enable/disable memory remap feature. Its mainly for if you have a 64bit OS and 4GB of RAM. Basically it allows you to remap the overlapped PCI memory above the total physical memory.

If that alone doesn't help, download the latest BIOS update from here and follow the steps outlined in the tutorial How to flash BIOS?.


I too had a similar problem to this when I upgraded my pc from 2 x 2GB to 2 x 4GB and had a similar setup; Windows 7 64 bit, American Megatrends BIOS. Tried all the software solutions proposed in the answers but no joy.

For me the problem was that one of the memory chips hadn't been pushed in with sufficient force (I have the strength of a little wood nymph).

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