I am attempting to setup my brand new GA-Z97X-UD5H-BK motherboard. I am using an Intel i7-4790 CPU and G-Skill F3-2133C11D-16GZL RAM, both of which are on the compatibility lists for this mobo. Leaving everything at default in the bios, the CPU shows a turbo speed of 4.0 GHz, just as expected. Also, without enabling the XMP profile and/or manually tweaking the memory settings, the memory (which is 2133MHz) is only running at 1333 MHz, which is also expected. However, an unexpected problem occurs when I attempt to tweak the memory speed in any way whatsoever. Whenever I attempt to increase the memory frequency at all, whether by using XMP or by manually tweaking it, the turbo frequency of the CPU automatically lowers itself to 3.8 GHZ. I have tried everything my 22 years of experience can think of, including manually tweaking the CPU frequency back up to 4.0 GHz, but nothing will bring the CPU turbo frequency back up to the expected 4.0 GHz unless I set the memory frequency back down to its default level of 1333MHz. What am I doing wrong? Is this normal behavior for this mobo, or is it defective?