my windows read only 2GB of my ram even though it is 4GB ram , what's the problem?

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thesniperharb

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Jul 19, 2013
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hi all , i have a DDR2 ram and it is 4GB , my motherboard can reads for maximum 8GB according to the website of my motherboard's manufacture , but my Operating system reads only 2GB of it ,

my motherboard is : asrock g31m-s , http://www.asrock.com/mb/intel/g31m-s/ .
my OS is : windows 7 ultimate 64bit.
 
Solution
B
Try this--
I had the same problem on a Gigabyte board GA-H55M-SH2 socket LGA1156 and so did many others with boards with the Intel H55 chipset---just checkout the forums.
My bios ,showed the correct total of ram--2x4gb---BUT it showed one of the DIMM slots as Disabled.
In win 7 64 bit ultimate, it showed as 8gb installed but only 2.96gb useable.
THE PC RAN OK BUT ABOUT ONCE A WEEK IT WOULD FREEZE UP.
Tried everything like many others on the net but could not fix it.
BUT NOW IT'S SOLVED.
My problem was caused by the contact fingers in the LGA1156 CPU socket on the motherboard, not contacting the contact pads on the bottom of the processor when it was installed in the socket.
When you looked at the fingers in the socket they all looked in...
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DougLYX

DougLYX

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Apr 9, 2011
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if it's a 2 dimm set, one of the modules may be defective and thats why it's showing only 1/2 of the memory total, go get memtest86 5.01 and check if one of the modules is defective....place 1 module at a time into motherboard if it's a 2 module set, if it's 1 module only..then it's most likely defective and has up to 1/2 of the cells on the module as defective.
 
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browser243

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Dec 27, 2014
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Try this--
I had the same problem on a Gigabyte board GA-H55M-SH2 socket LGA1156 and so did many others with boards with the Intel H55 chipset---just checkout the forums.
My bios ,showed the correct total of ram--2x4gb---BUT it showed one of the DIMM slots as Disabled.
In win 7 64 bit ultimate, it showed as 8gb installed but only 2.96gb useable.
THE PC RAN OK BUT ABOUT ONCE A WEEK IT WOULD FREEZE UP.
Tried everything like many others on the net but could not fix it.
BUT NOW IT'S SOLVED.
My problem was caused by the contact fingers in the LGA1156 CPU socket on the motherboard, not contacting the contact pads on the bottom of the processor when it was installed in the socket.
When you looked at the fingers in the socket they all looked in line and perfect---BUT somehow quite a few never contacted the processor pads and if you looked carefully at the pad you could see they were perfectly smooth with no evidence of contact scratching or indent.

After carefully bending the contact fingers up a bit and re assembling the PC with the 2x4gb ram sticks everything in the bios showed correctly 8gb' 2x4gb both dimms activated and in win 7 it showed as 8gb available/useable.

The PC has not frozen up since.

Hope this gets out on the web to help people who are having weird problems on some of the older boards---check the bottom of your processor for signs of contact marks on every gold contact pad.

 
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