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Actually on the backside you'd find another fan.
When I change the angle of the camera the modular connectors become more visible. let me zoom in a little:
Here we see connectors for six peripheral modular cables. These connectors are color coded black. The dark red connectors on your left are two additional dedicated PCI-Express modular cables, the two 12 volts rails. You'll also notice the 24 pin mainboard connector which was introduced with PCI-Express mainboards.
Worthy a photo, detail .. I love it. Excellent for a fool-proof setup.
Notice the green LED and below it the button ? That's the PowerGuard. It uses a small LED light and internal buzzer to indicate current power supply status. Under abnormal situation, the PowerGuard will turn off the power supply to protect your system and will start beeping. The button is being used to disable that alarm.
When we zoom in a little we'll see a multitude of heatsinks. Hard to see with this photo but the inside has a very clean layout.