The late 2008 MacBook Pro's tend to run hot. I use my model (2.53 GHz with the 9600GT enabled) mostly in clamshell mode with the Apple LED Cinema Display. In this configuration, the fan used to run almost constantly above 3000 RPM. While CPU temps stayed the same, the bottom enclosure and GPU temps decreased between 3 and 6 degrees C when sitting on top of the Antec. The cooler is quiet even on high, and 4000 RPM with cooler is quieter than 6000 RPM without cooler.
The most noticeable difference was running X-Plane. Before this cooler, the fan would spin up to 6200 RPM (max) almost immediately after the application loaded. With the cooler underneath, even after extended X-Plane use, the fan stayed around 4000 RPM. That's good enough for me.
The one complaint I have is the direction of airflow. I think it would be more effective if the air were to blow up out of the unit instead of it being sucked down into it. I tried reversing the fan (took the thing apart) but there must be a diode built into each fan as reversing red/black failed to spin the fans at all.Get more detail about Antec USB-Powered Notebook Cooler.
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