This is the air-cooled version of the machine. The cabling is on the messy side, the leads from the old Seasonic S12-380 power supply are on the short side, but it's quite effective at cooling. The rear Nexus fan draws the air in through the top hole and through the huge Scythe Ninja heatsink for the CPU. The rolled up paper tube directs part of the exhaust air from the blue Northbridge heat sink to improve its cooling. The hard drives are in the rack in the lower bay, cooled by their own 120mm fan, which is exhausted through the power supply, feeding the power supply with cool air.