Installed 16GB (2x8GB) of RAM. Computer only recognizing 8GB

Brualness · Mar 25, 2015

hello

just installed a new ram kit corsair vengeance pro 1866 16gb and it is saying 16gb (7.96 GB usable)

I have looked in the bios and it see all 16gb. i have done the windows maximum memory to 16gb check each stick in one dim at a time. and all worked fine window sshoweed 8gb with one stick in one dim.

Os windows 8.1 64 bit
cpu amd fx 6300
mobo GByte GA-990FXA-UD3
GPU AMD r2 9800x

thanks for any help

Duality92 · Mar 25, 2015

What does CPU-Z say? (send us a validation link)

Brualness · Mar 25, 2015

here you go

Duality92 · Mar 25, 2015

Quote:

Originally Posted by Brualness

here you go

What slots do you have them in? 1 and 2? Make sure they're either in 1 and 3 or 2 and 4.

Brualness · Mar 25, 2015

Quote:

Originally Posted by Duality92

What slots do you have them in? 1 and 2? Make sure they're either in 1 and 3 or 2 and 4.

they are in 1 and 3 or 2 and 4 isk which one

Duality92 · Mar 25, 2015

I would try reseating them both first

Brualness · Mar 25, 2015

Quote:

Originally Posted by Duality92

I would try reseating them both first

just tryed it and gave the dims a cleen still the same porb

Duality92 · Mar 25, 2015

does the bios detect it?

Duality92 · Mar 25, 2015

Googled this problem and I found this on Tom's hardware from a year back

http://www.tomshardware.com/answers/id-2028914/installed-16gb-2x8gb-ram-computer-recognizing-8gb.html

Same problem and it ended up being one bad memory stick.

edit : Unless you're using Windows 7 home

Brualness · Mar 25, 2015

Quote:

Originally Posted by Duality92

Googled this problem and I found this on Tom's hardware from a year back

http://www.tomshardware.com/answers/id-2028914/installed-16gb-2x8gb-ram-computer-recognizing-8gb.html

Same problem and it ended up being one bad memory stick.

edit : Unless you're using Windows 7 home

the BIOS shows all 16GB and i have each stick individually

Duality92 · Mar 25, 2015

Could you take that CPU-Z validation link please? (not a picture, the actual link to the web page)

DuckieHo · Mar 25, 2015

Quote:

Originally Posted by Brualness

i have done the windows maximum memory to 16gb check

Don't do that. Leave that unchecked.

That setting is only to limit resources for testing purposes.

Quote:

Originally Posted by Brualness

here you go

Why does it say you are in single channel mode?

Duality92 · Mar 25, 2015

Quote:

Originally Posted by DuckieHo

Don't do that. Leave that unchecked.

That setting is only to limit resources for testing purposes.
Why does it say you are in single channel mode?

Exactly what I was wondering also. That's why I asked which slot he had his ram in. Windows detects 16, which is even wierder.

DuckieHo · Mar 25, 2015

Quote:

Originally Posted by Duality92

Exactly what I was wondering also. That's why I asked which slot he had his ram in. Windows detects 16, which is even wierder.

You could have two 8GB DIMMs in single channel mode.... resulting in 16GB.

OP, what's the recommended memory voltage and is it set? I have seen this before where motherboard and tools detect the memory properly but OS does not. (The old NVIDIA 680i/780i experienced this quite often back in the day.)

Duality92 · Mar 25, 2015

Quote:

Originally Posted by DuckieHo

You could have two 8GB DIMMs in single channel mode.... resulting in 16GB.

OP, what's the recommended memory voltage and is it set? I have seen this before where motherboard and tools detect the memory properly but OS does not. (The old NVIDIA 680i/780i experienced this quite often back in the day.)

Quote:

Originally Posted by Brualness

just installed a new ram kit corsair vengeance pro 1866 16gb and it is saying 16gb (7.96 GB usable)

This is what I was referring to. It looks like what it does when you have a 32-bit OS with more than 3.4gb of ram. But with 16

DoctorNick · Mar 25, 2015

Have you tried to update the BIOS on your motherboard, if not try that.

Brualness · Mar 25, 2015

Had to run out will look and do all things when I get home

deehoC · Mar 25, 2015

I had this exact same issue and it turned out to be one of the DIMM slots on my ASUS Sabertooth 990FX R2.0 was bad right out of the box.

Do the following: Test each stick of ram individually in one slot. If your PC boots then odds are the other slot you were using is having issues. I almost ran out and bought a new RAM kit myself when this happened and after trouble-shooting it and then finally returning it to my vendor for them to troubleshoot we determined it was the slot.

edit: Found some old screenshots from when I had the issue. Also found the old thread I ran into while searching for a solution when it happened to me.

http://www.overclock.net/t/1469352/amd-build-with-8gb-memory-64-bit-win-7-but-bios-only-reports-4gb-and-windows-reports-3-90-gb-usable-single-channel

You can see that I have 2 DIMM slots populated and both seem to read perfectly fine in CPU-Z but my system showed 8 GB (3.90 usable) in this Windows system info page.

Also note it claims I was running in single-channel mode even though my PC was setup in a proper dual channel configuration according to my motherboard manual.

Brualness · Mar 26, 2015

i have Test each stick of ram individually works fine but my old x2 $gb kit was working in it just fine going to do a BIOS updata and get the CPU-Z validation link

Brualness · Mar 26, 2015

CPU-Z validation

http://valid.canardpc.com/cgnw28

Installed 16GB (2x8GB) of RAM. Computer only recognizing 8GB

Brualness

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Brualness

Duality92

Brualness

Duality92

Brualness

Duality92

Duality92

Brualness

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DuckieHo

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DuckieHo

Duality92

DoctorNick

Brualness

deehoC

Brualness

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