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4X4GB being read as 8GB

post #1 of 15
Thread Starter 
Bios and Windows are only seeing 8GB of ram. CPU-Z sees all four sticks and 16gb total.
I have tried each of the four ram sticks in all four slots. I have tried mixing them and nothing.

The two colors of my Ram slots cannot be combined (blue and black). I can put a ram card in either of them and it works fine. I can put two ram cards in both slots of the same color and it works fine. However, as soon as I try and mix the slots (1 and 1, or all four), it only detects one of the colors giving me either 4gb or 8gb depending on how many slots I used.

I can't tell you for sure when this exactly happened. I feel like once upon a time I had 16gb, but I don't remember for sure ever seeing 16gb. It's possible it was never that way.

I have updated my motherboard to the latest Bios. I have reseated everything in my PC as well as loosening the bracket on the CPU (read that could be the cause in another thread). It still feels tight though. If I keep loosening the screws, the mount just comes off without ever getting looser. I have also tried and successfully completed memok test.

Any other ideas? Do I need to RMA my motherboard?

Edit: I'm also running 'Windows 8 PRO' 64bit.



Edit:

I did some more testing:

A1 + B1 = 4GB
A1 + A2 = 8GB
A1 + B2 = 8GB

B1 + B2 = 8GB
A2 + B1 = 8GB
A2 + B2 = 8GB

So, It appears the only combination that does not seem to be working is A1 + B1. I have tried this with two different sets of ram. Is this the motherboard?
Edited by holynorth - 1/19/13 at 1:51pm
mHusky 1.2
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post #2 of 15
Do you have someone you could borrow 4 stick? that would help ruling the MB.
post #3 of 15
Thread Starter 
I'll ask around, but my roommate only has 2x4. I'll try his out and just see if it will work in dual channel.

Edit; Would another set matter? Using 2 of my sticks, they work fine unless they're in dual channel and one of them is not registered.
Edited by holynorth - 1/13/13 at 4:41pm
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post #4 of 15
Amazingly this is happening to me too.

I just noticed it yesterday, but I know that I have had 16GB available in windows because I have almost maxed it out before. CPU-Z can see all 4 chips, but windows and the bios cannot. Memtest lists all 4 but only test 8GB in single channel mode.

I haven't tried pulling out sticks and moving them around because this is the pc I work on and I need to keep working atm.

rig is in the sig (office computer)
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post #5 of 15
Thread Starter 
Interesting. Does anyone have any advice? I tested my sticks, they are read as 16gb in my brother's windows 7. Do I need to reformat? Motherboard or CPU problem?
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post #6 of 15
You may need to try raising your VDimm or your VTT (IMC) voltage, to get the IMC to use all the sticks.
post #7 of 15
Thread Starter 
Whats the other name for VTT? Is it Vcore?
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post #8 of 15
Quote:
Originally Posted by holynorth View Post

Whats the other name for VTT? Is it Vcore?

It should show up as VTT on an Asus board...
Vcore is your processor voltage, not the IMC voltage.
post #9 of 15
I tried a few things

Originally: 4 x 4GB = 16GB dual channel
problem:4x4GB = 8GB single channel
removed sticks from A1 and B1 = no post
removed sticks from A2 and B2 and moved them to A1 and B1 = 8GB
put those sticks in A1 and A2 = no post
same sticks in B1 and B2 = no post
same sticks put back into A2 and B2 with new sticks in A1 and B1 = 16GB dual Channel

So I resolved my issue by replacing the ram in the first slots.

I havent tested the sticks I pulled out yet, but 5 passes of memtest on the working 16GB looked good.
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post #10 of 15
Thread Starter 
I did some more testing:

A1 + B1 = 4GB
A1 + A2 = 8GB
A1 + B2 = 8GB

B1 + B2 = 8GB
A2 + B1 = 8GB
A2 + B2 = 8GB

So, It appears the only combination that does not seem to be working is A1 + B1. I have tried this with two different sets of ram. Is this the motherboard?
Edited by holynorth - 1/19/13 at 1:51pm
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