> Is it typical for the
> most-utilized card to run that much hotter than the other cards?
All modern electronics show such behaviour. Dissipation is directly related to
the number of flipping bits inside the chip. More activity means more heat.
You can observe this yourself. Check the temperature of your processor after an
hour idle, and after an hour rendering a picture. (In my case (a K6-233) it
rises from 35 to 85 degrees celsius)
Apart from the obvious, like blocked filters and air-leaks, please check that
you don't suck in preheated air from another machine.
45 degrees celsius is comfortably low for modern electronics. 60 or 75 degrees
shouldn't be a problem inside a box with sufficient airflow. (Without the flow
you'll get hotspots!)
Ruben
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