snatchysquid :
I want to buy a new PC with intel i5-6700k. What will happen if I want buy an overclocking motherboard? My friends tell me that my pc won't work well
What will happen if I want buy an overclocking motherboard?
What happens if I don't buy overclocked motherboard?
Your questions are arguing with each other. You should buy a Z170 board if you want a 6700K. Why not a 7700K? Z270 with the 7700K. Don't want to overclock? There are 6700 and 7700 CPUs that include the heatsink/fan.
Your PC will work fine if you don't buy an OC friendly board. The only issue will be the 6700K won't be overclockable. Very slight changes but nothing a Z170 board can offer the 6700K.
Did they mention any specific issue you might run into?