Hey buddy the fx70 is a great heatsing and i was using it with my Intel i7 4790k overcloced at about 4.70GHz it never got over 70 degrees celcius while running 100% load. Now i replaced it with a watercooling kit.(Rajitech triton kit)
Now what about the fx100?? I am using it on my 2nd PC which has a Intel Xeon E3-1275 v5 running at 3.50GHz it is running 100% load 70degrees celcius.
Over all i prefer a bit more the fx100 so yea