Spire SPA04S4-U WhisperRock V air cooler heatsink
 

But that said from our graph you can see this Spire SPA04S4-U does OK at our low power test which it is the intended for while the Spire SPA04S4-U and is only outclassed as we increase the heat beyond what it is designed to be able to remove. Our 170 watt test is a rather harsh test as we are sure you agree.

at: http://www.a1-electronics.net/Heatsi...4-U_July.shtml