Closed Installed memory 8gb 3gb usable Tags: Memory Windows 7 RAM Hewlett Packard Last response: February 3, 2012 2:53 AM in Memory Share luke040 January 22, 2012 5:45:41 PM so i recently bought a new HP ProBook 4530s which came with 8gb ram and it had windows 7 32bit operating. but when i checked how much ram it had, it came up with: 8.00 GB (2.69 usable) i also tried installing the windows 7 professional 64bit CD which came with it, but it does not work.. why is this happening?? More about : installed memory 8gb 3gb usable Best solution yamman101 January 22, 2012 5:59:07 PM You need to install a 64 bit operating system in order for the computer to use all 8GB of RAM. Until you do that, your computer will only recognise >4GB. RealBeast a b } Memory a b $ Windows 7 January 22, 2012 9:38:11 PM Yes, you MUST install the x64 OS to use over about 3.5gb of RAM. What do you mean when you say that Win 7 x64 "doesn't work?" Related resources Only 3gb Usable out of 4gb Memory in Windows 7 - Forum 8GB memory 2.93 usable ?? - Forum Toshiba laptop says it is only 3GB is usable from 4GB what does it meen - Forum Installed Memory vs RAM Usable by Windows My CPU? SOLVED! - Forum Installed Memory 8.00GB (2.92 Usable ) - Forum Can't find your answer ? Ask ! Get the answer 87ninefiveone January 22, 2012 11:30:10 PM Fixed. yamman101 said:You need to install a 64 bit operating system in order for the computer to use all 8GB of RAM. Until you do that, your computer will only recognise <4GB. luke040 January 23, 2012 7:36:36 AM thanks! All fixed now yamman101 January 24, 2012 6:32:42 AM 87ninefiveone said:Fixed. Thanks, I always get mixed up with the symbols lol luke040 February 3, 2012 1:44:13 AM Best answer selected by luke040. nikorr a c 146 } Memory a b $ Windows 7 February 3, 2012 2:53:35 AM This topic has been closed by Nikorr Can't find your answer ? Ask ! Publish Related resources: Forum[ Memory ]Win 7 64 8GB RAM installed 4 usable ForumWindows 7 64bit shows 3.73GB usable memory with 8GB installed Forum8gb of memory installed 7.90 usable ? Forum[Solved] 8GB Installed , 4GB usable on Windows 7 64 bit Forum4gb ram but 3gb usable Forum4gb ram installed 3gb usable ForumOnly 4gb Usable out of 8gb Memory in Windows 7 Forum"Reboot and select Proper boot device" More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !