I didn't overclock anything by myself on my Gigabyte Z97 UD5H, I just left everything on auto.
However leaving it like this Intel does its Turbo boost thing to go from 4 Ghz to 4.4 (factory default OC), and temps jump from 55-60 to 70-80 degrees Celsius, for 400 Mhz alone.
The fan on my Hyper Evo ramps up from typical 1200-1400 RPM while gaming to 1700-1800 and sounds like a jet engine. As soon as I disable Turbo boost, fan is silent, highest it goes is 1471 while gaming, and it stays around 853 on desktop environment.
Is this normal? I know 77-80 Celsius is bearable for a CPU but I'd rather not go there for a measly 400 Mhz, although I would like to have them if possible to avoid these massive jumps in temperature and fan speeds, in consequence.
I know its not the HSF's fault, if I leave my computer to be idle the temps on the CPU drop as low as 32-34C in a room where it's 23-24 C.