Re: Thermal fans / panels / noise etc

On Mon, 09 Apr 2007 00:43:11 GMT, dk@xxxxxxxxxxxxxxxxxxxxxxxxx (DK)
wrote:

In article <ctti1358m097aveqknfnaki94l5u5bg433@xxxxxxx>, T i m <news@xxxxxxxxxxxx> wrote:

You have measured the temperature of the hdd's and GPU?

Nope, I did not. For one simple reason: The chipset and CPU
temperature is lower in the new case. The same setup in the
noisy and less efficient old case was just as rock stable as it
is now.

So the HDD's and GPU *could* be running very hot but they aren't
showing any problems (hypothetically)?

Actually, now I do seem to remember that at some point I run
Seagate diagnostic utility that reports, among other things,
temperature. I think it was something along the lines of 50C.

Hmm, and that was sorta my point. On my new PC the HDD's are nearer
30C (quite a difference) possibly because of the front case fan. Not
that I'm not suggesting that is an issue and your observations seem to
suggest it isn't, at the moment at least. This old box here (full
height tower) has also run faultlessly for the 3 mobos (upgrades) it
had in it over the last few years but possibly more by luck than
judgment. It does have a front case fan running on 5V (I assume it's
still running <g>) but also has the 2 IDE HDD's in plastic removable
caddies with their noisy fans removed.

FWIW I've just checked with SpeedFan 4.32 and one drive is 39C and the
38C (but they have been creeping up slowly for the last hour+).

Thinking of the front / rear fan thing .. if I just wanted to have
one, is it best to push or pull?

With one, I'd imagine it's pull. That's what I have now - one
case fan in the back and one PSU fan. Did not compare directly
though.

I was trying to think what was going on in the case re airflow. Say
you just had the PSU and CPU fans. The CPU fan would just blow air
round the CPU HS and that area of the case in general. The PSU being
at the top (in most cases anyway) would take the warm air from the
case and extract it out the back, leaving a net negative pressure in
the case. This means air would have to be drawn in from wherever
possible and with this new case that would be the front panel grille,
a grille at the bottom at the back over the PCI slots and the rear
(vacant) case fan grille. Sooo, if all this takes the path of least
resistance then that could mean that the exhausted warm air could be
drawn back into the rear grille rather than the front? (On this new
case there are also side grilles over the CPU and PCI slots that would
also allow air to be drawn in bypassing the front to back flow thing).

With your setup the case fan and PSU fans are both trying to extract
air from the case and as long as there were plenty of inlets elsewhere
I guess they wouldn't be in competition. If there wasn't enough easy
airflow I wonder if it was possible for the case fan to actually (say)
overpower the PSU fan and pull air back the wrong way through it (my
new PSU moves air very slowly indeed)?

All the best ..

T i m

p.s. According to SpeedFan I also have a Temp1 and Temp2 and they are
a constant 29C and 42C (This is an AMD Sempron 2600+ in an Asrock
K7VT4A+ 1.0x)





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