Windows 7 64 bit does not recognize 8 gig ram?

I don't have a first-hand experience with a situation like this, but I heard that you may have to enable memory remapping in the bios. I don't know if it is called exactly the same on your board, but you may have to look for something like that in the bios.

If you're *sure* you're running the 64 bit version of the OS, from here I see two possibilities. The first is your motherboard may have a limitation - either by design or by BIOS setting. Check your motherboard's support page to verify your motherboard actually supports 4GB of ram or more. Then check your BIOS for a feature called Memory Remapping. If Memory remapping options appear in the BIOS at all, make sure it is turned on.

For the second: Click the Start orb, and type in msconfig. Right click the msconfig app to run it as Administrator. That brings up the configuration utility. Click the Boot tab, and then click the Advanced Options button. In that window, there is a setting for Maximum Memory - Make sure the checkbox for it is clear (not checked), then reboot your computer.

Do you have an 1156/1366 socketed board? Read the i3/i5/i7 'Missing' Memory section of the 'sticky'...

I am running w7 64bit with 8G ram .... AMD rig ...see my SIG ...worked fine with w7 64 RC as well ...but I have an issue with CPU Fan Failure ...see my posts.
Frank

I was having an issue where my 32 gigs of installed memory was only offering 16 gigs usable. This was due to my version of windows 64 bit being the Home version rather than the Ultimate or pro versions which now support 32 gigs of ram. Perhaps this is you issue as well.