That cooler is excellent, but you have to have good case ventilation.
Often one of the most overlooked, and easiest things to improve in air cooled systems.
Air's biggest downfall for cooling, is it's extremely low thermal capacity (how much heat energy is required to raise the temperature of the mass absorbing the heat). The two main that contributes to air's ability to cool well, is the volume of air absorbing that heat. One other factor that plays into this, is the difference in temperature between the sink and the air. A greater difference between the two means that the air can absorb more energy before temperatures equalize, as well as heat transfer happening more rapidly when there is a greater temperature difference. Both the volume of air absorbing the heat, and the temperature difference between the heatsink and air are enhanced greatly by good case ventilation.