Let’s try to narrow down the issue. Check if you are running the latest INF and Management Engine drivers of your motherboard AsRock Z97 Pro4.
Then, run a stress test using only motherboard, cpu, 1 memory stick without graphics card. The tool is called Intel® Processor Diagnostic Tool (file name: ipdt.64b.zip)
Run the test without any other application, at the end, go to View tab, pay attention to expected cpu speed and current cpu speed. Both should be the same.
I dont know why this clock is 4.9 ???
Today I restart settings of my motherboard to default and the scoe of test is same:
--- Reading CPU Frequency ---
Expected CPU Frequency is --> 3.30
Detected CPU Frequency is --> 4.93315
CPU Frequency Test Passed!!!
Expected frequency - The highest frequency at which the tested processor was manufactured to operate
Detected frequency - The frequency at which the tested processor is currently operating
Power management modes can create marginally higher or lower detected frequency
than expected frequency. Small variations in clock frequencies are common.
All settings are on auto (default)
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The BIOS of your motherboard has an option to over clock the processor. Your processor has a base frequency of 3.3 GHz and Max Turbo Frequency is 3.7 GHz.
Intel® Turbo Boost Technology increases the speed of the Cores; however, only 1 Core reaches 3.7GHz and the rest run at slower speed. Review below table.
Right now, your motherboard is increasing the speed of the 4 Cores at 4.93315GHz. The processor is supporting customized settings, but it can fail sooner or later and system might experience BSOD randomly. The processor is not working under default settings.
Please take into consideration your processor supported RAM is DDR3L-1333/1600 @ 1.5V, If you are using DDR3 and it is also not the specified frequency 1333 MHz or 1600 MHz then your processor is not running under specifications and thus random BSOD's(Blue Screens) could occur.
I suggest testing your System with suggested specifications and you could also check the RAM memory. How do I know if my computer has a memory problem?*
Please let us know if the issue remains after testing it with the suggested Memory type.