Why does AMD & Nvidia Make Reference Cards
Centrifugal fans blow air to the sides of the fan. So they are placed on one end of the heatsink and they blow air through the heatsink and out the other end:
These fans have to spin pretty fast to push much air, so they are typically noisier than axial fans, but the way they blow the air means that it exhausts out the back of the case.
Meanwhile, axial fans blow air down into the heatsink, and it hits the bottom and disperses in all directions, taking the heat with it. These fans can push a much higher volume of air than centrifugal fans at much quieter volumes, and you can have more than one, further increasing airflow and decreasing noise (because with more than one fan, you can have them spin at slower speeds and still get a lot of air flowing). You can usually fit more heatsink into these cards as well since the fans sit on top of the heatsink, while blower fans are as tall as the whole card to maximize airflow from them as much as possible, so they take up space on the card that could otherwise be heatsink fins. However these custom cooler designs usually exaust the hot air back into the case, so it's not good if you have 3 or 4 graphics cards in a system, or a system that has a lot of heat and not a lot of exhaust case fans.
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