Those volts are way too high. I would only go up to 1.35, or 1.4 absolute max for 24/7 overclock. I know each cpu is individual & overclocks different, but with my 4820k I got it stable 4.5ghz at 1.170 volts & 4.7ghz at 1.310 volts. Make sure you set the voltage manually in the bios, never ever overclock your cpu with it set to auto.