The Arctic Cooling Accelero S1 is a passive VGA heatsink designed for the silent operation of even the largest and hottest video cards. Now in it's second iteration, the S1 is compatible with a number of video cards from both Nvidia and ATI, including the latest 9000 series from Nvidia and 4000 series from ATI. Packaged with miniature heat sinks for both voltage regulators as well as RAM modules, the main S1 heat sink is designed to cool the GPU alone with a copper base and 4 copper heat pipes, spanning out and connecting with 30 alluminum fins. Designed to work passively with no active fan cooling - the S1 is most effective with some airflow in the case to cary away heat. For hotter, often overclocked enthusiast parts, slow 120mm fans are often placed near or on the S1 to aid in cooling but maintaign low volume levels.
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