heatsing for 3886

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hi folks...
I happen to have lots of these heatsinks, from old IBM pentium machines, is there a possibilitty to use them as 3886 heatsinks, one per device. Dimensions :length 5,5-8cm, widht 7 cm, height 2,5 cm.
 

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Depending on the power you want to deliver and the supply voltage, but IMHO they are too small.
If you put the fan that comes with the CPU, then they may do (if you dont' mind the noise), but otherwise, I think they won't be enough even for no-signal (idle), where the LM3886 can dissipate up to 10W.
 
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