I've lost track of what's what in this thread,,, but one thing occurs to me...
I remember years when Digital caught on that heat rises. Suddenly, they put their power supplies in the top of their cabinets -- and avoided having to change to chilled liquid cooling in their mainframe-class systems. They also saved money by venting the cabinets to/through the top, using fans to accelerate the already naturally rising air.
Now take a look at Apple's latest: the Power Mac G5. Is that not the power supply on the bottom, with the G5 blocks just above, and fans that blow perpendicular to the natural direction of the hot air?
Perhaps there be [continued] clue[lessness] there?
I don't think it's the case with the G5. There comes a point that when you use enough fans so force air to go in one direction that it will just go in that direction due to differential air pressure. Also, the G5 is divided into sections so heat from one department doesn't invade another. I mean it'd be something like 6 ft long in the body if you re-arranged the internals into individual head columns.
Another thing that gets me is Ux horizontal rack-mount systems. Makes much more sense to me to mount them vertically and draw air off the top edge of each one, rather than horizontally and struggle with trying to blow it all out of the front/back.
-- Mark Benson
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