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Installed 16 gb of memory computer only using 8

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August 25, 2012 5:47:11 PM

Hello everyone,
A few days ago I finished building my first custom computer. However, I seem to be having problems with the amount of RAM I installed. I put two XMS 3 8gb cards in, but it only uses 8. I am currently using Windows 7 Home Premium 64 bit and I was told that it could use up to 16 gb. I would really appreciate it if I could get some help with this.


ASUS m4a89gtd pro
AMD Phenom II processor

More about : installed memory computer

a b } Memory
August 25, 2012 5:58:03 PM

Do you have the ram correctly inserted into slots A1 and B1
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August 25, 2012 6:01:48 PM

abekl said:
Do you have the ram correctly inserted into slots A1 and B1

Yup
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a b } Memory
August 25, 2012 6:03:05 PM

what motherboard? have you checked the QVL to make sure your board will take that ram? check bios updates as well?
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a b } Memory
August 25, 2012 6:03:42 PM

The only thing I can think of is bad ram.
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a c 109 } Memory
August 25, 2012 6:04:12 PM

Strange.

Possibly one stick is defective, or not seated well.
For less than a full complement of sticks, there are specific slots which must be used first. Check your motherboard manual.

Run cpu-Z. On the memory tab, it will show the total amount of ram.
On the SPD tab, you can select each of the 4 slots to see what is installed in each.
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August 25, 2012 6:05:44 PM

geofelt said:
Strange.

Possibly one stick is defective, or not seated well.
For less than a full complement of sticks, there are specific slots which must be used first. Check your motherboard manual.

Run cpu-Z. On the memory tab, it will show the total amount of ram.
On the SPD tab, you can select each of the 4 slots to see what is installed in each.

Well they seem to be seated in there quite fine. However, I'm not sure how to tell if one is faulty.
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August 25, 2012 6:07:18 PM

daswilhelm said:
what motherboard? have you checked the QVL to make sure your board will take that ram? check bios updates as well?


they're both the same manufacturer/type of ram....


Are you on a old ass motherboard? lol. cause i remember when the 775 socket motherboards only supported 8GB of ram...\

Edit: Nvm. just saw you just built it lol.
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August 25, 2012 6:12:15 PM

daswilhelm said:
what motherboard? have you checked the QVL to make sure your board will take that ram? check bios updates as well?

An ASUS m4a89gtd pro
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a c 109 } Memory
August 25, 2012 6:18:25 PM

Tossnerd said:
Well they seem to be seated in there quite fine. However, I'm not sure how to tell if one is faulty.


The gold standard test for ram is memtest86+.
You should be able to get through a couple of full passes without ANY errors.
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