Are you sure? because right now my cpu is running at 3.4ghz with 1.35 volts, did a aida64 strees test for 2 hours and temps were maximum 74 degrees, i´ve seen with 1.35 i could get at least at 3.8ghz or i am wrong? also when overclocking, which settings i have to look for in bios besides cpu core ratio in this case would be 38.00 and core voltage?No. - you should NOT overclock your R5 2600 with just a stock cooler on it.