I have a case with two fans set to pull air from the case.
The case itself has slots around the lower side panel to let air in.
Setting the rear fan to push, where it blows almost onto the cpu
cases a 2-3deg rise in cpu temp over the other way. The front fan
causes the harddrives (next to, but not in the flow) to run
~5deg hotter, but one is much hotter than the other, instead of
being nearly balanced (raid 0 array - 2 ibm deathstars)
It seems that airflow within the case is the most important fact.
Sucking air out of the case helps avoid hot/cold spots caused by a
flow of air that seems to just go in one fan and out the other,
without doing anything elswhere in the box!. I am also
a bit dubious about 1 suck, 1 blow from the point that
the fans are basicly handling the same air, meaning total flow
is less. Did try to setting both case fans to blow, but no real
difference over the imbalances of each being reversed singly.
I have hacked the case to remove any obstructions to the fans as well.
Maybe this year I'll get through an aussie summer without meltdown ...
BillK
This may be useful as a comparison for some:
rattus root # sensors;hddtemp /dev/hde /dev/hdg
w83697hf-isa-0290
Adapter: ISA adapter
Algorithm: ISA algorithm
VCore: +1.77 V (min = +1.71 V, max = +1.88 V)
+3.3V: +3.24 V (min = +3.13 V, max = +3.45 V)
+5V: +4.91 V (min = +4.72 V, max = +5.24 V)
+12V: +12.20 V (min = +10.79 V, max = +13.19 V)
-12V: -12.03 V (min = -13.21 V, max = -10.90 V)
-5V: -4.95 V (min = -5.26 V, max = -4.76 V)
V5SB: +5.44 V (min = +4.72 V, max = +5.24 V)
VBat: +3.39 V (min = +2.40 V, max = +3.60 V)
fan1: 5000 RPM (min = 3000 RPM, div = 2)
fan2: 2896 RPM (min = 3000 RPM, div = 2)
temp1: +41�C (limit = +60�C) sensor = thermistor
temp2: +46.0�C (limit = +60�C, hysteresis = +50�C) sensor = thermistor
alarms:
beep_enable:
Sound alarm disabled
/dev/hde: IC35L060AVER07-0: 37 C
/dev/hdg: IC35L060AVER07-0: 36 C
* the cpu fan is a 6000 rpm on a copper heatsink running
at its middle speed (to avoid noise abatement notices
from the neighbours - its 7am) Ambient is ~24degC house
heating is on as its early spring and 13degC outside.
cpu is a tbird 1.4G room heater. Running a backup job
compressing a few Gbytes to iso's for burning so cpu is
working hard, but disks about average. Unloaded cpu
sits about 38C->40C under these conditions.
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