So I decided to upgrade today to 16gb of ram (4x4gb). I bought the same exact kit as I had before but if I have all 4 dimm slots filled, the board gets stuck in a no POST bootloop.
I tested each ram dimm individually and they all work. The motherboard is on bios F7, I did try F8f beta with no luck.
Specs:
I5 4690k
Gtx970
4x4gb g.skill ripjaws x
OCZ ZS750w