RAM slot 1-3 or 2-4? (dual channel Skylake DDR4)

My motherboard is an MSI Z170A Gaming Pro, my CPU is an i7 6700K, and my RAM is HyperX Black Fury 2x8 DDR4 2666MHz sticks, and I currently have the two sticks in slots 1&3 as 2&4 didn't boot. The one thing I'm a little on edge about is that in the motherboard manual, it states to put the RAM in slot 2 first, followed by a picture with two RAM sticks in slots 2&4. My PC didn't boot when I put mine in 2&4, but it does in 1&3. Does having the RAM sticks in 1&3 work on dual channel, the same as if I were to have the RAM in 2&4?

Also, would this RAM be automatically overclocked to 2666MHz automatically, as I've noticed in the bios, or do I have to activate XMP mode?
(I think it shows up as 1333mhz in CPU-Z). Thanks for the help!
4 answers Last reply
More about ram slot dual channel skylake ddr4
  1. DDR. Double Data Rate thus 1333 x2 is 2666. Really doesn't matter which two slots you use. Both do dual channel speeds.

    Odd that slots 2&4 didn't work.
  2. Should work in either set of slots 1-3 or 2-4, might try resetting CMOS and try 2-4 again and ensure sticks are fully seated - if no joy with that might be a problem w/ the mobo
  3. Had the same problem. Only fixed it when put on 1 and 2.i have similar build. Msi motherboard is a bit buggy atm in my opinion
  4. MSI is known for having very good QC ;) One of the reasons I won't build on them
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