Overclocking my 4GHz CPU fails at 4.2GHz!?!?!?!? Please Help!

TaintedGG

Reputable
Mar 11, 2016
134
0
4,710
Hi,
Here is my build - http://au.pcpartpicker.com/list/4WxTHN
So I'm new to overclocking. I understand the basic idea behind it and did my own research on overclocking. I followed a tutorial and in my UEFI turned off some settings that it told me to turn off and increased my multiplier by 21x changing it from 4000MHz to 4200MHz. I load up my pc and go to run prime 95. Instantly two of my cores come back failing (core 4&5). I quit the test, go back to my uefi and increase the voltage from 2.875 to 3.000 and run it again same problem and I believe on the same to cores. I run the test at base clock for just 5 min and nothing. Am I just really bad at overclocking or is something not right here???

Thanks for any help.