Voltage connector (optional) 80 x 80mm Side Fan with protected metal grill preinstalled on panel - blows air directly over CPU. Predrilled PIV screwholes on M/B plate. Folded interior, smooth, dipped finish. Removable side panels with excellent ventilation. For use with AT/Micro/ ATX mainboard. Socket 478 PIV board 12 x8.3" compatible. (Compatible to 12x 9.6" boards but lose 1x5.25" expandibility.