In Figure 5, you can see the top view of TMG IA1 and have an idea of the shape of the heatsink fins. At first look it seems like the front tabs are a good idea because, as we said on last page, these tabs "involve" the fan, but the rear shape seems to be of more an aesthetic effect than of a performance-increasing system.
The power connector is a three-pin micro type, without the speed control pin (PWM). However, the fan speed can be adjusted through a little potentiometer attached to the fan. The cable from this potentiometer is very short and thus you cannot adjust the fan speed without opening the case. A pity.