I know this is reeeaaal late on this topic, but I am currently doing a build with the sabertooth z77 mobo and looking for a proper CPU heatsink that wont cover Mem slots and will fit properly. I just wanted to notify you that it is most likely your RAM that is affecting the whole system. The RAM you have selected is NOT compatible with MoBo or the CPU, here are some links. http://processors.fi.../Intel-i7-3770K
As this shows that the CPU can only use 1333 RAM and 1600 RAM, and your RAM just is not compatible with the MoBo.
Also if you look at your graphic above with the system build, your mem clock is only 1066 MHz.... on 2133 RAM, not to mention it is bad RAM in the first place I would recommend http://www.newegg.co...N82E16820231416
times 2 if you want 16GB.
I almost made this mistake too, but did some research.
On my way to order the Hyper 612