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12-inch runs cooler with lid closed
I was amazed too, but using Marcel Bresink's excellent Temperature Monitor I found that my 12-inch aluminum powerbook (Rev A) actually ran cooler (by about 1.5 deg C, as I recall) with the lid closed than with the lid open and the LCD turned off. Go figure.
I use a Podium Pad that elevates the rear end of the laptop, and things may be different if it is in contact with a surface. Also, I did this testing before downgrading my AppleADM103x.kext to the one from 10.2.8, as described in this hint and the reply by junkiesxl , which may affect the results. Perhaps more understandably, it runs even cooler upside-down (in which case the lid must be closed, obviously). At some point, I may re-wire things and see how it runs when positioned vertically, like a book ...
12-inch runs cooler with lid closed
I recently purchased one of the new (G4, 1.5GHz) 12" Powerbooks to replace my senile (P2, 266MHz) Linux box as my main PC, for work, school, and everything in between. I planned to use it on my desk, with a "real" keyboard, mouse, and monitor, 90% of the time, so I was a bit taken aback when I found out running these things closed was considered unusual around the Apple community. |
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