ATI Radeon X850XT Platinum Edition
 

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As you can see the card is equipped with a copper heat sink and large red exhaust fan. The fan helps to reduce overall system temperature by drawing internal air over the heat sink and expelling it from the back of the computer. On the back of the card you will notice the metal band in the form of an L shape. This does two very important things, a it helps cool the memory by spreading the heat and b acts as a brace for the heat sink taking stress from the card itself.