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Ya, I think it has to do with the chipset more then the heatpipes. 😛
The 9400M G models are going to be cooler since the processor and GPU aren't on the same heatpipe. The processor has its own heatsink and fan while the chipset has a passive cooler.
 
Here's my 2.4ghz aluminum iMac under normal use just reading forums.

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What's the name of this app ? 🙂
 
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