well, what are the risks of memory overclock? what damages could result; we know that for example vga overclock can fry the gpu;and thats bad

Also, my motherboard is an MSI, and it has an AMIBIOS.In its menu, there is a section, RAM settings, where there is an option to change the memory for the folowing system speed: "fast,turbo or extreme".Now, in your opinion, what damage could this make if I turn on to extreme, other than no system boot.
Thanks!