Originally Posted by altfy6
I have a desktop computer with a dual quad core and 10 gb of ram. It has Windows 7 Ultimate 64 bit. After the computer fully boots I go into the computer properties and it only says 5 gb.
I had a similar problem with a Dell computer. It too only recognized half the RAM. What the problem turned out to be was single versus double sided RAM. I don't remember which (single/dual) recognized the full amount of RAM, I just remember that I had a large amount of RAM to test in the system and the problem seemed to be that the motherboard just refused to see the full amount of RAM on certain sticks.
You might want to check your manual to see if it supports the RAM you have. Often the manufacturer web site will list recommended RAM.
Hope this helps.