Question x79 Abnormal RAM if I try to use Triple Channel.

[remz09]

I am using an old ASUS P9X79 Motherboard (not WS/Pro, Just P9X79) and trying to use triple channel memory.
I have 12gb of RAM in total, 2x4gb of Samsung Memory and 1x4gb of Kingston.
I have them installed, CPUZ says I have triple channel and 12gb of RAM but BIOS says I only have 8gb.
Checked BIOS and saw Abnormal on the RAM status. I am confused as to why this is happening.

PS: All 3 RAM have 1333mhz speed. Checked the timings, the Kingston ones are different.

 

[Starcruiser]

Mixing RAM is never a good idea. You'll want matched sets if at all possible. Different timings especially will cause problems.

Ensure you have the latest BIOS for maximum RAM compatibility.

You'll want to make sure that the RAM you use supports Tri- or Quad-channel. If not, then you're doomed to start in this endeavor.

Are you following the RAM slot diagram on page 2-5 of the manual? It's HERE for reference. You'll want to use A1, B1, and C1 for triple channel.

Also in your manual:
"Always install DIMMs with the same CAS latency. For optimum compatibility, we recommend that you obtain memory modules from the same vendor. "