I have an i5 4690k overclocked to 4.2GHz overclocking is stable, I had no problems with the processor, i even pushed it to 4.6ghz. 24gb ram they work at 2000MHz, Asus Maximus VII Ranger and AMD RX 570 8gb msi. A couple of weeks ago I took a new keyboard Redragon k552 and since then it gave "Code 64" and the computer will not boot into Windows. I do not understand what causes it. I also have an old keyboard which I tried and everything works perfect. Is there any solution for this code 64 other than using the old keyboard or changing the new one for another?