I'm running a i7 3930K and this is what I see when running CPU-Z
http://gyazo.com/81c4a462b6196be6813e37c5ee3d211e
http://gyazo.com/81c4a462b6196be6813e37c5ee3d211e
Explain what? The clock speed?
speed step tech, has been around for 10 yrs at least
http://en.wikipedia.org/wiki/SpeedStep
The voltage doesnt change curiously, possible that CPU Z is too slow to capture the new value, try using another soft to check if CPU Z is accurate.
Yes. Why does it fluctuate? Sorry for my ignorance but new to Intel.