My computer has a case temperature sensor on the front of although I don't
know how good it is, and is also doesn't to Celsius; it does Fereignheit.
Keep in mind that my room doesn't have air-conditioning - it's running at
84.2. My room is in the basement. (I'm the 16-year old son.) I have the
Aspire X-Dreamer II case.
http://www.newegg.com/app/ViewProduc...144-026&depa=0
FYI: My case came with the side panel fan and the top fan. Both of these
have the holes cut out already with alien grills. I also bought an aluminum
case fan with blue LEDs. I'm a little disappointed in it because it doesn't
have as much air flow as the rest of my fans do. I've also upgraded the PSU
to a 400w PSU with 2 fans. (I know the PSU fans to play much of a role)
I've got an Asus A7V333 motherboard, AMD Athlon XP 2400+ CPU, Kingston
PC-3000 DDR RAM, NVIDIA GeForce3 Ti200 128MB DDR TV Out, 200GB of total disk
space (2 WD's), etc. etc. My system is not water-cooled.
"Rusty" wrote in message
...
Case air flow is dependent on case design, motherboard layout in the case,
position of additional pci/apg cards, type of cooling on the cpu and video
card (fan, heatsink, water cooled), wire location, and wire configuration.
In general you want air to flow in at the bottom front of the case and out
the upper back of the case. Having said that, the blow hole in the top of
the case would move hot air out using natural convection forces (hot air
rises). Seeing that the fans in the back of the case are elevated in
comparison to the front of the case hot air would naturally exit the upper
back of the case, therefore the fans in the back of the case should
exhaust
out hot air (blow air out of the case).

The issue of the side case fan blowing air into or out of the case depends
on the location of the fan. If the side case fan is located relatively
close to the cpu then the side case fan should blow air into the case. If
the side case fan is located above the cpu and relatively close to the
power
supply it should blow air out of the case. In most of the cases I have
seen
the side panel case fan is located relatively close to the cpu and
therefore
should blow into the case providing cool fresh air to the cpu fan.

In relationship to a positive or negative pressure in the case, my
experience and testing lead me to believe that a positive case pressure is
better for two reasons. One, the positive pressure will prevent dust from
entering into the CD drives and covering the laser lens. Two, a positive
pressure keeps the heat build up around the power supply from entering
into
the case around the cpu. A positive pressure means that you will have
higher cubic feet per minute fans blowing into the case than out of the
case.

The best way to setup case cooling is to use a fan contoller or manually
adjustable high speed variable fans (thermaltake smart fans, evermax fans)
especially at the front intake area of the case and buy a cheap
indoor/outdoor thermometer to monitor the temperature, adjust the fan
speed
and watch the case temperature at various spots (esp around the cpu and
hard
drives). Remember that more case fans does not lead to better cooling,
proper air flow though the case leads to better cooling. It also helps to
remove those stupid built in hole drilled case grills with a demel or tin
snips and use a wire grill in its place (if necessary).

If you think that this is long, you should see an engineering paper or
article discribing the effects of fan placement within a PC case. It is
very complicated and unpredictable. Try it, monitor it, and see if it
works
for you.


"Travis King" wrote in message
news:72HBc.70875$Hg2.61444@attbi_s04...
I have three questions regarding case fans even though I know that this
is
an Asus newsgroup. Should the back case fan blow in air or blow out
air?
Should the case fan in the side panel blow in air or blow out air?
Should
the case fan on the top blow in or blow out? Help would be appreciated.
Thanks.