Hello, I have an i5 6600k with a gigabyte z170 gaming 7 mobo. The original bios was F6 and when I overclocked by cpu using the Auto overclock to 4.4ghz it was working. I even try 4.5Ghz and it works. I didn't touch the voltage and kept it stock. I then flash my mobo to F21, so it can support 7th gen series when I decide to upgrade. When overclocking the cpu again using auto overclock to 4.4Ghz I get BSOD. Before the bios update it was able to 4.4g-4.5ghz. now with the f21 bios I cannot achieve those results as before. If anyone has the same mobo and cpu, can you tell me what was the original voltage that previos bios were at and what is the voltage I need to get those speeds again. Thanks