8Gb installed as Dual Channel but Windows says only 4gb is usable, why?

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Nestor Magalhaes

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Mar 23, 2014
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As the title says.

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The only thing I can think of right now is shared RAM between the CPU and GPU. Integrated graphics use your memory instead of their own. Usually it's not more than 2GB. Maybe yours are up to 4GB as default? I find it quite unlikely to be honest but possible. In this case, you usually can set the amount you want to share on your BIOS. Try searching for the current value and then lowering it.
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shinfujiwara

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Aug 26, 2011
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I just saw the OP is running a X64 installation, in that case, I honestly wouldn't know what to say. Never ever happened to me. I find it really weird. Did you have access to more than 4GB on other OSes?
 
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Muhamad Mustaqim Hashim

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Jun 26, 2013
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no, i use windows 7 ultimate 64 bit, its detect 8gbs but usable ist 4gbs. why? can u help us?
 
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shinfujiwara

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Aug 26, 2011
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The only thing I can think of right now is shared RAM between the CPU and GPU. Integrated graphics use your memory instead of their own. Usually it's not more than 2GB. Maybe yours are up to 4GB as default? I find it quite unlikely to be honest but possible. In this case, you usually can set the amount you want to share on your BIOS. Try searching for the current value and then lowering it.
 
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Solution
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Fjapkasse

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May 23, 2014
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What worked for me, was going to Admin. tools -> System Config. -> Boot -> Adv. Boot Options and set Maximum memory to 8192 instead of unselected. then it both saw and used all 8GB.
 
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llcrazy

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Oct 31, 2014
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I did try starting the cpu is a single memory at once, and exchange slots and what resulted was that one was damaged just would not start with it so I just change the ram and I solved my proble bye grax

traslate by google
 
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mutt33778

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Dec 12, 2014
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I have a 64 bit version of Windows installed, but still can only use 4 gig of memory of the available 8.
 
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involver

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Jan 9, 2014
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I have the same problem . Bios reports 4096 MB . It happened out of the blue . Everything went fine for a couple of years . Didn't find the answer . Booted Linux , PartedMagic , same thing . Needless to say that i was using 64bit versions .
 
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