I have a Kaby Lake i5-7400 CPU on a Gigabyte GA-Z170XP-SLI motherboard. Recently, I decided to delve into overclocking, and found that I was able to increase the CPU multiplier from the default of 30 to 33 then 35 without stability issues. CPU benchmark seems to reflect appropriate speed increases, so all seems well. (CPU-Z Screenshot)
My question is, how is this possible? Everything I read seems to suggest that only the "K" Intel CPUs have an unlocked multiplier, and mine is definitely not a "K" series CPU.
Am I doing something wrong? Should I change the multiplier back to 30 and use BCLK to overclock?