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Solved: only 8Gb RAM usable of 16Gb


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ajkane   (Aaron) ajkane is offline
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07-Apr-2012, 03:45 AM #1
Solved: only 8Gb RAM usable of 16Gb
A friend and I have recently built a computer and it went together smoothly, but we noticed that in windows it says only 7.95 Gb of our 16Gb of RAM is usable. I went to msconfig and Maximum memory was unchecked. I also went into the BIOS and found memory remapping was also enabled. We have spent hours on this problem and any help would be greatly appreciated.
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07-Apr-2012, 03:50 AM #2
What Windows are you on? All Windows can address only a limited amount of RAM, ultimate 64-bit can address the most.
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07-Apr-2012, 03:55 AM #3
Starter and Home Basic 64-bit editions are limited to 8Gig Ram, so if you are using one of those, upgrade to Home Premium, which caps out at 16Gig or Ultimate, which caps out at 192Gigs (WOOT!).
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07-Apr-2012, 04:24 AM #4
I am on windows 7 Ultimate x64
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07-Apr-2012, 04:56 AM #5
Shouldn't be a problem then. Reseat them, maybe?
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07-Apr-2012, 05:43 AM #6
Is there a maximum for each slot on the Mobo? Often there is a 4Gb max. so if you have two 8Gb sticks that would explain it.
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07-Apr-2012, 07:26 AM #7
Yes, that should explain it! I wonder why I never thought of it..
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07-Apr-2012, 09:11 AM #8
What mobo does he have or is it a prebuilt system? Some mobo's won't support 16gb.
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07-Apr-2012, 01:47 PM #9
This is a top-of-the-line system which supports 32Gb of RAM, here are the specs

Mobo: crosshair v formula/thunderbolt
CPU: FX-8150
RAM: x2 G.Skil low voltage (1.25) sniper series 1600Mhz (4gbx2) [That totals to 4, 4gb dimms, for a total of 16gb]
GPU: Sapphire Radeon 7970
HDD/SDD: OCZ Vertez 3 120gb, and WD CB 1.5 Tb

There is no reason that this computer can only use 8gb of the RAM
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07-Apr-2012, 01:49 PM #10
in the run command type in msconfig and hit enter.
this brings up the system configuration box
second tab is boot section
select advanced options
another box pops up and you will see maximum memory uncheck the box
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07-Apr-2012, 08:59 PM #11
Quote:
Originally Posted by ajkane View Post
I went to msconfig and Maximum memory was unchecked....
I have already checked msconfig, thanks for the suggestion though.
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07-Apr-2012, 09:13 PM #12
From a practical point of view, it won't make any difference. Your machine is unlikely to use more than 3 GB's no matter how much is available. I started with 24 GB's, but reduced it to 12, then 6 because it slowed things so much. Boot time, hibernation, etc. were taking a long time.

Really the only good reasons for more than 4 GB are virtual machines and RAMdisks.

What kind of graphics do you have? How much shared graphics RAM is there?
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07-Apr-2012, 09:30 PM #13
I have a radeon HD 7970, so I shouldn't use any RAM for graphics memory
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07-Apr-2012, 09:36 PM #14
ajkane, how have you checked your usable memory outside of Windows? Does the installed RAM show correctly in BIOS? Have you run a memory diagnostic like Memtest 86+? You really need to eliminate any potential hardware issues before you try to troubleshoot Windows. In decreasing order of probability, I would expect one or more defective RAM modules, a defective motherboard, or a bad memory controller on the CPU. Sometimes you have to tweak the voltage on the RAM a bit. This post on Corsair's support forum should answer most of your questions about running Memtest 86+.

Last edited by Snagglegaster; 07-Apr-2012 at 11:10 PM.. Reason: senior moment
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07-Apr-2012, 09:41 PM #15
I have not rum memtest 86+ but I have gone into the BIOS and all 4 DIMMs are recognized and all reported as 4gb @1600mhz 1.25v I will run a memtest and come back with the results.
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