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 209 $ 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 Solvedi have installed 6gb of ram one 4gb 1600mhz and another 2gb 1600mhz my pc shows total memory installed 6gb but only 3.88 usabl Forum Solved4 gb installed but only 3.5 usable in 64 bit windows 7 Forum Solved8Gb installed as Dual Channel but Windows says only 4gb is usable, why? Forum Solved8GB Of Ram Installed, only 4 showing w/ 3.47gb usable (I think I fixed it) Forum Have 4GB installed ram but only 2.75GB usable Windows 8.1 pro x64 Forum Windows 7 64 Bit 4GB installed but only 3.48 usable Forum Solvedolder hp pavillion upgrades a6234x showing 6gb ram only 3.5 usable Forum 8gb Ram Installed, and detected by windows, but only ~4 (3.93) usable Forum Just installed 8gb ddr3 and only 4.9 is usable.. Forum Solved5GB installed only 3.25GB usable Forum Solved4 GB ( 2 X 2 GB ) RAM ! Only 3GB (1.50 Gb usable ) Detected ! And I have Win 7 64bit ! Forum installed vengeance DDR3 1600 mhz 2x4Gb ram. system will not boot. only 5 long beeps. Forum Solved8GBRAM (2X4GB 1333mhz) why 3.74 usable ? Forum SolvedWhy are only 3.4 GB of 4 GB usable in my W7 64-bit? Forum i7 3960x with 4gb ram but only 3.15gb usable Forum SolvedWhy is only 2GB of my RAM usable? Forum i have Asus r7 240 ddr3 2gb gpu. Tried to install in my pc which has pci e gen 2 x16 slot. psu with 450 w. but only the fan on Forum Solved16GB installed only 2Gb is usable - Please Help Forum 4Gb of DDR3 ram, only 2Gb is Usable Forum SolvedI installed 4 gb ram but only 1.60 gb is usable Forum More resources Read discussions in other Windows 7 categories Configuration Customization Drivers Security Laptops !