Ram detection problem

[Yutzar]

Hello everyone I'm having issues with the detection of my memory sticks by the BIOS (and therefore windows itself) and hope you can help.
The issue is as follows, I have these two different types of sticks (1 & 2) and would like to use 2 sticks of each which should give 12GB however the bios only detects part of it.

Here's some hopefully useful info :

-OS : Windows 10 Preview 64bit (issue also happened on 8 and 8.1)
-MOBO is ASUSP8P67 Pro Rev 3.1 (the bios is up to date)
-Issue still happens wether memory remap is enabled or not.
-I have not made any modifications to either voltage or timing


I'll describe some layouts that I tried and the results they gave :

Layout 1 : 2GB in A1 + 4GB in A2 : BIOS detects 4GB
Layout 2 : 2GB in A1 + 4BG in B1 : BIOS detects 6GB
Layout 3 : 4GB in A1 + 4GB in B1 : BIOS detects 8GB
Layout 4 : 2GB in A1 + 2GB in A2 + 4GB in B1 + 4GB in B2 : BIOS detects 6GB
Layout 5 : 4GB in A1 + 2GB in A2 + 4GB in B1 + 2GB in B2 : BIOS detects 8GB

No matter the layout CPU-Z will always show the correct amount and the SPD tool inside the
BIOS will also recognize every stick without any issue.
From what I can gather the problem does not seem to come from the compatibility of the sticks between themselves else Layout 2 wouldn't work, it seems like the bios only accepts one stick on each channel.

If you need any more info just ask !
Thanks in advance !

 

[awesomedude911]

from my middle class knowledge, I have tried mixing different brands/ models and they end up not working. You have to have all the memory all in the same package.

Also the volages, timing, and Cas Latency (7 vs 9) are different.

 

[Yutzar]

The mixing part is working as stated in the post and is not the issue 😉 When using the full set of 3x2GB (which are all identical) only 4GB will be detected.

 

[Yutzar]

Up !