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Only 4gb of 6gb RAM listed as "Usable"

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  • Windows 7
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Last response: in Memory
November 4, 2010 3:01:59 AM

I am having problems with a build I completed about a month ago. I have 6gb of Mushkin RAM in a Gigabyte UD3R mobo. However, the computer lists only 4gb as "Usable." The problem didn't arise until I recently reinstalled Windows 7 for unrelated reasons. Before reinstalling all 6gb were recognized as usable. I am 100% positive I have the 64-bit version installed.

Any ideas? I think the sticks are all good, since they were working fine for the first month (I'm hoping... because it's too late for returns). I checked to make sure they are all still seated properly. I have not done any overclocking on this machine, but I read on other forums that improper voltages might cause this problem?

Thanks for any help,

Let me know if any other info would be helpful.



Running a full version of Windows 7 home premium. Intel i7 950.

More about : 4gb 6gb ram listed usable

a c 347 } Memory
a b $ Windows 7
November 4, 2010 12:56:43 PM

Welcome to Tom's Forums! :) 

Do you have any partitions and/or bootable HDD/SSD with 32-bit OS installed.

1. Load Optimized {you may also elect to Clear CMOS; shutdown}
2. Verify Advance Boot Options {MSCONFIG}

Please post the following:

My assumption is that the 'missing' 2GB is H/W reserved. Also,when you 're-installed' the OS did you by chance reinstall the CPU??

Furhter, I assume the RAM is properly install AND seated correctly in the DIMM slots DDR3_1/3/5

Next, if both the Resource Monitor and/or CPUz only show 4GB vs 6GB you 'may' have a bad stick.

If this is the case {or you want to test} then run Memtest to check if you have a bad stick D/L and create a bootable CD/DVD {ISO/zip} -
November 4, 2010 9:14:29 PM

Thanks for your reply,

I have no partitions and/or bootable HDD/SSD with 32-bit OS installed.

1. Loaded Optimized
2. Verified Advance Boot Options - They are the same as your pic

Resource Monitor

It looks like all 6GB are accounted for according to Resource Monitor. 2GB are on hardware reserve. So I assume those 2 GB will be used if needed?

After my original post, I had upgraded from Home Premium to Academic Professional. Take a look at the resource manager when I had Home Premium installed:

Just kind of interesting I guess.

RAM installed and seated correctly, and in the proper slots

Resource Monitor and CPUz both show 6GB installed.

I'm going to run Memtest just to make sure.

a c 347 } Memory
a b $ Windows 7
November 5, 2010 12:51:29 PM

The reinstallation corrected the problem! It is NOT normal to have 2GB of 6GB reserved in a 64-bit; it IS normal if your prior OS was 32-bit.

Running Memtest won't hurt a thing.

Good Luck! :)