Clear lines and a smooth steel construction define the sophisticated style of the 678C, featuring a crystal-clear side panel made of tempered glass that showcases your system's components. It includes high-density soundproofing material on the sides, front, and top for quiet operation, or the included dust filter on the top when performance is the top priority. Choose from a variety of cooling options with space for push/pull coolers in the front, top, bottom, and rear areas. Powerful and efficient airflow with room for up to 9 fans for enormous cooling potential. Take control of your cooling with a PWM fan controller for the two included SP140 PWM fans and up to four additional ones. Reduce fan speed when you want to keep your system quiet, or increase it when you want to boost performance.