How do you get 32bit Windows XP Pro to display correct amount of RAM installed?

I have the Viper Machspeed MNVS-939 with 4gigs of RAM dual channel correspondence and Dual Core CPU. With OS 64-bit Windows see the 4gig. But with an operating system 32-bit Windows only shows 2gigs. I tried to enable / PAE in boot log without any effect. Is there anything I can do to fix it and if it is a waist to use as much ram with an operating system 32-bit?

A 32-bit application can only address a maximum of 4GB of RAM. Not 32-bit application can address more than that. Win XP 32-bit (Home or Pro) does not allow 32-bit applications to access 4GB of RAM. The reason for this is, Linux itself is a 32-bit application. Reserves an amount of RAM by itself, and one of the ways it does this is to limit all processes fight over the same maximum of 2GB of RAM. What this means is that if you have five 32-bit applications open at the same time, they will all fight on the same 2GB of RAM, regardless of how much RAM you have. For this reason, Win XP 32 bit is not going to see more than 4GB of RAM, no matter how much RAM is "really" there. Actually, adding more than 4GB of RAM on Win XP 32 bit can cause the operating system to get a little lost in space for extra memory, and become unstable. So -- Do not add more than 4GB of physical RAM if you are running 32bit Win XP (Pro or Home)! Just because you have the RAM slots does not mean that the 32bit Win will play nice with it! One last Note - Some users will notice that not all physical RAM installed on a workstation is "seen" by Windows. Right click on My Computer "and show properties. It's common to just say to 2.75GB though 4GB is installed. This is called "The Black Hole. "The reason for this is PCI-Express. The BIOS of your workstation will have physical RAM away from windows to use as a buffer zone for the transfer data to the PCI-Express, whether you have the PCI-Express or not. The value of the "black hole" that is needed is relevant for the amount of installed RAM - more RAM, oo largest black hole. So if you have PCI-Express on the desktop of your motherboard, you are likely will see the "Black Hole".

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