dimension (w / h / d) (w) 266 x (h) 598 x (d) 628mm weight net weight: 13.8 kg; gross weight: 17.8 kg material chassis: al. appearance: al (side panel: 1.5mm) motherboards extended atx, atx 5.25" drive bay 7(exposed) 3.5" drive bay 4(hidden, converted from 3x5.25 inch drive bays) i/o panel usb 2.0 x 4, ieee 1394 x 1, esata x 1, mic x 1, audio x 1(support intel hd / ac 97 audio) expansion slots 7 slots cooling system front fan(intake): one 120x120x25mm, 1200 rpm, 17 dba (included), top fan(exhaust): one 120x120x25mm, 1200 rpm, 17 dba (included), top fan: 120mm x 2(optional), rear fan(exhaust): one 120x120x25mm, 1200 rpm, 17 dba (included), side fan(intake): 200x230x30mm, 900 rpm, 150 cfm(included) power supply standard atx ps2 / eps 12v (optional) optional component transparent side panel, fan bracket other keep-out requirement for cpu cooler installation:, at least 5.7 inch(145mm) separation between motherboard and the side panel of cosmos s