Going to one HD 4542
Not at all. If you blow down instead of parallel to the heat sink fins, you need a larger heat sink, and more air flow from the fan, to get...
Jean-David Beyer
Then why does Intel suggest blowing cool air horizontally over the heat sinks? Blowing down (allowing air to leak out at the sides, with the air leaking forward opposing the prevailing...
Mainly because it simplifies duct design. Air blown out of a duct has some directionality, so it merely has to be directed toward the heatsink. Air sucked into a duct comes in equally from all directions, so it needs to be nearly a perfect fit. Also, heatsinks tend to be more effective when air is blown downward at it rather than sucked upward from it.
On two of my workstations, I don't even have a duct! The air blowing out of the flipped fan PSU is already directional enough to sufficiently cool the CPU.
For a single fan computer, the CPU and PSU usually have to share airflow in series, and that means compromises.
It makes more sense to put the PSU before the CPU than putting the CPU before the PSU. The CPU typically tolerates higher operating temperatures, and also typically generates more heat than the PSU. Also, CPUs tend to have built in hardware to throttle or shut down automatically in case of overheating. A PSU's thermal safety feature is usually limited to thermistor fan control, if anything.
For quiet computing, thermistor fan control is a mixed blessing. If the PSU is sucking hot air from inside the case, the fan will usually ramp up and ruin quietness at even modest loads. However, if the fan is flipped so that the PSU is sucking cool air from outside the case, the fan will only ramp up under very heavy loads (if ever).
Yes. I deduced that it couldn't possibly be a 200meg drive because there's no sense in discarding a 20gig drive instead of a 200meg drive.
Isaac Kuo
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