usable memory

Alright, so. I have 4GB of DDR2 ram installed on my computer, when I installed windows 7 and then go to system it says; RAM Installed 4GB (2.94GB Useable) Now, my question is. Why? Has anyone else had this problem. Here some more information. 1. Windows 7, 7100 RC. 2. Windows 7 IS...

So I have 6 gb ram (4 corsair 2 G.Skill) but when I go to my system properties it shows Installed Memory: 6.00 GB (3.00 GB usable). When I pull the 2 G.skill's out it reads: Installed Memory: 4.00 GB (3.5 GB usable). Two questions: why is it when I decrease my ram from 6 to 4 GB do I...

I recently upgrade from 7000 build to 7057, and I discover that in the basic computer parameters screen, appear that in memory ram installed 4000 mb but only 3000 usable. since windows vista I usually have the 64 bits OS, because I know that in 32bits don't recognize all the memory installed...

Hello. I'm using Windows 7 on one of my older boxes. It's an older AMD X2 and I just upgraded from 2GB to 4GB of PC3200 DDR. The issue is that Windows is not allowing all 4GB to be used. The system shows that 4GB is physically installed, but is only listing 3GB usable. This is somewhat...