Games Freezing After Overclock + Stress-Testing and Other Overclocking Complications

[KnightPlutonian]

So I recently overclocked my i5-6600K to 4.4 GHz by changing only the ratio and want to test whether or not it's stable, as I've been having a few problems with games crashing after the overclock. I assumed the games were more GPU intensive than CPU intensive, but since nothing else has changed I'm assuming it's the CPU that's causing the crashes. How should I test the CPU if I don't have a second screen to monitor things while I'm playing games? I'm fairly sure all my temperatures are good, as running Cinebench doesn't bring temperatures any higher than 50 degrees, but is there a better (free) test to stress-test with? And are there any other things that might be causing my system to freeze?

 

[Tradesman1]

Go to the CPU voltage and try adding a ositive offset of + 0.075 to the voltage