ey, I'm running Windows 7 Professional 64-Bit and I have 6GB of Kingston HyperX RAM on my motherboard which is a ASUS P6T SE which can have 24GB of RAM, but Windows 7 is only saying there is 4GB of RAM, but when I run CPUZ is says I have 6GB. Anyone know what might be wrong?
There is a limit of 4GB on the 32-Bit version. I do know that... 64-Bit Professional should be capable of supporting up to 192GB! I know a few users here run 7, so I'll see if they can help you out...

Can you verify how much your BIOS shows as installed?
(12-02-2009 01:56 AM)GT4AWD Wrote: [ -> ]There is a limit of 4GB on the 32-Bit version. I do know that... 64-Bit Professional should be capable of supporting up to 192GB! I know a few users here run 7, so I'll see if they can help you out... 
You are appropriate because Most new accouterments has 64-bit drivers, and even accepting a lot of applications aren't 64-bit complete yet, 32-bit ones usually run just fine.
I'll have to double check but I believe that you have to have 64-bit drivers for a 64-bit OS. Perhaps you are thinking of programs. In that case you can usually run 32-bit programs although you might have some issues with legacy programs such as old games.
This is very strange. I have never seen any problem of like this. First you make sure and confirm your bios setting. I think there you can get exact right information.