Need help setting up 4x4GB DDR3 in an MSI Z97 Gaming 5 MB

I've been using 3 sticks of 4GB RAM, and I went to add the fourth stick but I can't get the computer to boot with all 4 sticks in. The motherboard's LEDs show error code 26, which is apparently an "OEM pre-memory initialization code". I have two slightly different but mostly identical sets of RAM sticks I'm trying to use:

The current configuration I'm using that works is blue in DIMM 2, red in DIMM 3, and another blue in DIMM 4. If I put the final red stick in DIMM 1, I get the 26 error code at startup. I've tried googling it and I've read the manual but I'm not 100% clear on what "XMP" means or how to tell if I'm dual channeling correctly (manual says to use DIMM 2 and 4, but if I use all 4 slots then what?). Any help would be very appreciated, and I can post bios screenshots if needed.

My PC:
CPU: i7 4790k
RAM: 12GB DDR3 1600 (trying to go to 16GB)
Motherboard: MSI Z97 Gaming 5 (manual here:
650W PSU
980 Ti GPU
Reply to bonzaixx1
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More about setting 4x4gb ddr3 msi z97 gaming
  1. Best answer
    When mixing modules ther is no guarantee they will work together. Even identical modules purchased at separate times can be incompatible.
    Reply to SR-71 Blackbird
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