Okay here are some things that i tried so far :
Windows Power Management is put to High-Performance
I did turn off from my BIOS :
Enhanced Speedstep technology
And nothing of those changes helped , so i`m starting to wonder if there is something wrong with my CPU,or maybe there are some more setting in BIOS that i don`t know about.
In this case I would recommend to run on your system the Intel® Processor Diagnostic Tool, it checks for brand identification, verifies the processor operating frequency, tests specific processor features, and does a stress test on the processor, so that way will know if there is something wrong with your processor.
Here is the link Intel® Download Center, once the diagnostic is done Go to> File and sent us that file, just make sure that when you're running the tool do it without the graphics card, set the memory at 1600 Mhz and set the processor to the base frequency(4 Mhz), that way will test the processor at the standard settings.
Another thing to mention is that you're running DDR3 2400Mhz when this processor supports DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V, memory sticks with higher speed than the set on the processor will overclock your system and you might end up with low performance, here you can check the specs ARK | Intel® Core™ i7-4790K Processor (8M Cache, up to 4.40 GHz).