Help: Win 7 64bit showing 8GB usable RAM when 16GB is installed.

wuming79

Reputable
Oct 28, 2014
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4,510
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Hi,

I am using a GA-55A-UD6 MB and with 4 x 4GB on dual slot memory. As of the MB manual, I installed on the correct memory slot if I am using 4 DDR3 RAMS. Using CPU-Z shows I have 16GB too. I can't seems to figure how to make window detect the full RAM. Hope to get some advise here.

 

wuming79

Reputable
Oct 28, 2014
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4,510
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Tried the above including upgrading BIOS to F11. still didn't work.

 

CPU Fan

Honorable
Jan 7, 2014
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10,640
4


Start by pressing the windows key and typing msconfig then hit enter. Go to advanced options in the Boot tab. Make sure "Maximum memory" is unchecked.
 

wuming79

Reputable
Oct 28, 2014
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4,510
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Still showing 8GB of 16GB used...
 

Doom Occulta

Reputable
Jun 6, 2014
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I'm experiencing the same problem. I'll check the serial number written on the package, but it's a pair of Corsair Vengeance (2x8Gb, 1866 MHz). I'll try the steps shown above and then I'll feedback about it.
 

yeskay

Admirable
Jul 12, 2014
1,258
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6,460
500


Physical Memory Limits: Windows 7

The following table specifies the limits on physical memory for Windows 7.

Version - Limit on X86 - Limit on X64
Windows 7 Ultimate - 4 GB - 192 GB
Windows 7 Enterprise - 4 GB - 192 GB
Windows 7 Professional - 4 GB - 192 GB
Windows 7 Home Premium - 4 GB - 16 GB
Windows 7 Home Basic - 4 GB - 8 GB [You must be using the X64 of this Windows Version. Hence, due to OS limitation, only 8GB is allowed to use, even though it detects the full 16GB]
Windows 7 Starter - 2 GB - N/A

Source: https://msdn.microsoft.com/en-us/library/aa366778%28VS.85%29.aspx#physical_memory_limits_windows_7
 

Doom Occulta

Reputable
Jun 6, 2014
2
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4,510
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Forgot to tell it before, but my rig is running W7 Ultimate x64. Mobo is M5A99X Evo R 2.0. Strangely but, in last year, just before thinking about increasing the RAM value, I was using a pair of Corsair Value Select (2x4Gb, 1333 MHz), and it was running in dual-channel, but with the new pair it isn't.
 

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