minimum heatsink size for lm3875

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I did a search, but I couldn't come up with the minimum size a heatsink should be for the lm3875. If I have good ventilation, would I be able to use one athlon heatsink for two chips? Also, would I be able to use the heatsinks from a pc power supply? If the chips are running around +-35v, how many watts of heat do they produce?

Thanks for any replies

Matt
 
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