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. Share RealBeast a b } Memory a b $ Windows 7 a b α HP 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?" Score 0 Related resources Installed Memory 12gb, 8gb Usable. - Forum [Memory]Win 7 64 8GB RAM installed 4 usable - Forum [Memory]Win 7 64 8GB RAM installed 4 usable - Forum Windows 7 64bit shows 3.73GB usable memory with 8GB installed - Forum 8gb ram installed, only shows 3.95gb usable. Pics inside - 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. Score 0 luke040 January 23, 2012 7:36:36 AM thanks! All fixed now Score 0 yamman101 January 24, 2012 6:32:42 AM 87ninefiveone said:Fixed. Thanks, I always get mixed up with the symbols lol Score 0 luke040 February 3, 2012 1:44:13 AM Best answer selected by luke040. Score 0 nikorr a c 146 } Memory a b $ Windows 7 a b α HP February 3, 2012 2:53:35 AM This topic has been closed by Nikorr Score 0 Can't find your answer ? Ask ! Publish Related resources Solved8Gb Ram installed and 3.95GB usable??? PLEASE HELP!!! 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 Solvedi installed 8gb ram (2.99bg usable) and my processor is Intel i5-2500 CPU @ 3.3GHz, ang my video cars is Gforce 9500 GT. Forum Solvedram usable 8gb installed (5.96gb usable) Forum Solved8gb installed - 4 gb usable, Win 7 64bit Help Forum Solved8GB RAM installed Windows 8 64bit says (3.9 GB usable). Help! Forum SolvedOnly 4GB usable of 8GB installed, tried entire checklist by now! Forum SolvedInstalled ram 8gb usable only 3.41gb...? Forum 8GB installed, 3.95GB usable on 64Bit Win 7 Forum AMD Radeon R9 RAM: 8GB installed but only 4 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 Installed Ram is 8gb, but it shows 3.87 Gb usable Forum 8gb installed 3.74 usable?? Forum More resources Read discussions in other Memory categories Compatibility DDR2 DDR3 Dual Channel RAM Corsair G.SKILL !