Windows 7 - Problem with memory. Would someone want to answer few questions.

Hey.

My English not perfect but i think you gonna understand what i try to say.

I just would like to know one thing about memory. I just got new 2X 4GB 1600 mhz Corsair vengeance (DDR3, CL9) memory sticks. I tried to put them on my computer where i have 2X 2 GB OCZ 1600 mhz (DDR3 CL8). When i put every stick on use my computer shows that installed memory is 12 GB and usable is 6 GB (on windows 7 64 bit). My bios shows that i have 6 GB memory. And Cpu-Z shows that all memories are installed but only 6 is on use and that channel is single.

My motherboard is Asus Maximus III formula. Max installed ram should be 24 GB. I also tried a few different settings with my memories. Like you should know i have A1, A2 and B1, B2 places on my motherboard (for those memories). I tried this kind of settings:

A1 and B1 Corsair 2 X 4GB --> Bios shows 8 GB installed like windows (and all 8 GB usable). These settings are only where Cpu-Z shows that memory channels are dual.
A1 and B1 Corsair 2X 4GB, A2 OCZ 2GB --> bios shows 4 GB and windows that 10 GB installed and 4 GB usable.
A1 and B1 Corsair 2X 4GB, A2 and B2 OCZ 2x 2GB --> bios shows 6 GB and windows that 12 installed and 6 GB usable.

So i would like to know that is my problem caused by those memories, cause they aren't same CL (8 and other 9). I stop fighting with those memories if that problem is so simple. I tried so find answer for this question but couldn't find it anywhere. I just thought that it's pretty weird that my computer still finds all memories and works fine in windows etc...

I appreciate your help.

I got that problem solved.

How did you solve it? I am curious, and it might be beneficial to others with the same problem.

Well... I'm not shure how i solved it. I did all these things first:
1) Booted bios
2) Installed newest bios (or in my case reinstalled the newest bios)
3) Installed newest chipset drivers
4) Just switched memory sticks from one place to another

In the end i installed A1 and A2 place those Corsair 2 X 4GB memories and B1 and B2 place those OCZ 2X 2GB memories. After all that switching i just restarted my computers bios and windows showed 12 GB installed and usable. So i'm not shure what solved that problem in the end. Now my CPU-Z shows that memories channels works as dual. And those Corsair memories works with different latency and mhz that those OCZ memories. If someone else have same kind problem he could try to do all i did. Let's hope that it will help someone. Those chipset drivers can cause some problems, but after sometime i got those work. After those install parts i did the switching and it helped.

My guess is it was either 2 or 4 that did it. Your BIOS may have had an update that provided better RAM support, or putting the RAM in the correct dual slots allowed it to work together as intended by the manufacturers. My instinct is it was most likely 4., but it still may have been 2.