Here’s a fantastic OC guide that may well have missed your attention. It comes from the guys at guide GIGABYTE, who totally have you covered if you’re using the latest the company’s latest Z370 motherboard offerings and the latest Coffee Lake architecture CPUs from Intel. The guide is pretty thorough as you’d expect and covers the basics as well more advanced operations that should allow you to breeze past stock settings. There’s even a specific section that focuses on getting a Core i7 8700K past the 5GHz threshold.
For reference we are using a GIGABYTE AORUS Z370 Gaming 7 motherboard and an Intel i7-8700K CPU. Based on our testing many Intel i7-8700Ks can hit 4.9-5GHz, without delidding, using standard air coolers and around 1.25-1.3Vcore. This is our experience with the CPUs we’ve tested. You may find that your CPU will overclock better (or worse) than our samples so keep that in mind when doing the testing.
The guide goes on to offer detailed instructions about configuring system memory, altering the CPU multiplier, disabling Power Management and VT-d settings, altering the CPU Uncore Frequency and adjusting the Voltage settings. The Advanced section also covers topics such as how Load Line Calibration, CPU VCCIO and CPU System Agent Voltage, among other things.