I installed 2GB X 4 in my PC why is it that only 3 5 is USABLE? Tags: Configuration RAM Windows 7 Last response: April 17, 2011 4:38 PM in Windows 7 Share danny926 April 17, 2011 1:07:14 PM hello, why is ti that only 3.5 is usable in my RAM while I installed 8GB (2GB x 4)? More about : installed 2gb usable treefrog07 a b $ Windows 7 April 17, 2011 3:06:03 PM It sounds like you are using the 32-bit version, and not the 64-bit version. The 32-bit versions can only see and use ~3.5 GB of total memory, while the 64-bit version has much, much higher memory limits. albinoshadow April 17, 2011 4:00:24 PM @Treefrog07 Correct, 64-bit (Ultimate for me) runs up to 256gigs of RAM where as 32-bit can't cap 4gigs of RAM so I hear. Over all you needa upgrade your OS. Can't find your answer ? Ask ! Get the answer sminlal a c 208 $ Windows 7 April 17, 2011 4:38:30 PM Assuming that you really are running the 64-bit version of Windows, the problem may be due to your boot configuration. Try this: - Start -> type "msconfig" in the search box and hit <enter> - Click the "boot" tab - Click the "Advanced Options..." button - Make sure that the "maximum memory" option is not checked. Can't find your answer ? Ask ! Publish Related resources: ForumInstalled 4 gb of RAM memory, but BIOS says only 2. 5 gb are usable Forum4 gb installed 2gb usable . ForumInstalled 16GB memory, only 8 usable , please help! ForumOnly 3 gb Usable out of 4 gb Memory in Windows 7 Forum4 GB of RAM, but only 2GB usable ? Forum6GB installed 5 GB visible 2GB usable ? :( Forum4 GB Installed - 2GB Usable ForumWin7 64bit 6gb RAM shows only 2gb usable ForumOnly 3 GB Usable and Slowing Down my System (64-bit OS) ForumWindows XP Home only recognizes 2GB of 3 GB installed ram Forum4 gb RAM installed but only 2.75gb usable with a 64bit Win7 ForumMotherboard & Windows only recognize 2GB RAM when 4 GB installed..why ? ForumWhy are only 3.4 GB of 4 GB usable in my W7 64-bit? ForumWindow 7 ultimate hp product key Forum2007 office vista and I installed wind and it is 64ows 7 ForumFind dongles that work worldwide on windows 7 ForumWe are using more than 20 computers in our network but my laptop only keep chang Forum[Solved] Change ACHI controller that appears to be in IDE emulation mode ForumWindows says i have 4.00 gb ram but only 3gb is used. ForumI have MDAC 2.8 installed but need the support you get from 2.5. How do I uninst More resources Read discussions in other Windows 7 categories Configuration Customization Drivers Security Laptops !