Re: CPU temperature VS. system temperature

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Jim Macklin (p51mustang[threeX12)
Date: 10/04/04 

Date: Mon, 4 Oct 2004 11:47:03 -0500

The CPU temperature sensor is on the CPU. do you know where
the "system temp sensor" is located? Your new air-flow
pattern has probably created an eddy in the air-flow and the
sensor is in that eddy (dead air).
If you can make a side panel with a window and use some test
smoke so you can see the air-flow, you might be able to use
baffles or ducts to control the eddies. Your mobo manual
should have a diagram that shows the location of sensors.
Also, support from the maker of your case, should be able to
advise on the best location and orientation of the fans.

Remember, the temperature on the RAM and the graphics, even
the hard drive, is also important, so you need air-flow over
the entire system, not just a "system temp sensor." 

-- 
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
"Opticreep" <opticreep@yahoo.com> wrote in message 
news:9e1f277e.0410040602.19e9a551@posting.google.com...
| First of all, thanks to everyone (on a previous thread) 
who suggested
| a few changes on my PC's fans to improve the CPU 
temperature.  I ended
| up redirecting the fans on the side panel from "exhaust" 
to
| "intake"... and I moved the extra exhaust fan at the back 
of my PC
| further down, away from the power supply.  The idle CPU 
temperature
| went from 45 degrees all the way down to 37!  And the peak 
temperature
| under heavy load went from 64 degrees to 58 degrees.  I 
was amazed at
| the drastic temperature drop from simply moving the fans 
around.
|
| But a strange thing happened: My system temperature went 
from 32, all
| the way up to 42.   I had thought that a better air 
circulation, which
| lowered CPU temperature, would also lower the system 
temperature.
| Instead, system temperature went up by a full 10 degrees.
|
| I don't get it at all.  I find it hard to fathom that the 
system
| temperature would be five degrees higher than the CPU 
temperature.  I
| would expect it to be the other way around.  In fact, I'm 
worried now
| that the motherboard's temperature sensors are either 
broken, or
| unreliable.  The system temperature reading remains fairly 
constant
| (+/- 1 degree) even when the Radeon 9800 Pro card and the 
CPU are
| working full speed.  Is 42 degrees too hot for a system 
temperature
| during idle time?
|
| Anyway, am I better off with the new setting (CPU 37-58 
degrees,
| system 42 degrees) or the old setting (CPU 45-64 degrees, 
system 32
| degrees)?

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