I did have my Fan at 100%. Stock cooling will not do it. As soon as you put a load to them they go over the 50's and can get into the 60's. This thing loaded never gets above the low 40's. It makes a HUGE difference. I couldn't get above 675/1462 before no matter what I did. It just wouldn't do it. They like to run cool. The watercooling is what did it for me.