Why is there a need to overclock core i5 with z170 when costs will bring the same as buying core i7 with h170 board? Speedwise i7 will be faster and more powerful. Overclocking may also possibly damage components and generate more heat. Overclocking memory will need for example a more costly memory like g.skills. z170 vs h170 board difference in cost can go for i7 in a stable base clock