View Full Version : Best sensor placements.
I got a new sun-flower fan master and it comes wiht 4 temp sensors cpu, hard drive, case and power supply. I just wnated to know what would be the best placements for thses sensors?
11-19-03, 04:26 PM
You can't get a good CPU reading with a temp probe like that, so I would reccomend you use one for the intake air temperature instead.
11-20-03, 06:24 AM
Check this out about thermal probe placement.PLACEMENT LINK (http://www.themodfathers.com/articles/temptest.php) :D I'm just giving you some options.
11-20-03, 10:55 AM
Originally posted by Colin
Any diode inside the chip will be far more accurate than a thermal probe placed outside the chip. Think about it, how accurately can you tell the temperature of an oven or a refrigerator with a thermometer mounted outside on the door? For more info read Why Many Thermal Measurements Are Not Valid. (http://www.arcticsilver.com/measurement1.htm)
Here's an interesting heatsink round up (http://www.digital-daily.com/cooling/athlon-coolers-2003q1-2/index08.htm) that illustrates the point.
You may find Temperature Sensing Technologies (http://www.microchip.com/download/appnote/analog/adc/00679a.pdf) a good read too.
Now that we have figured out the best place to read the temperature is inside the CPU die, another problem pops up. With PII and PIII CPUs, the sensor was in the hottest part of the chip. Here's what Intel has to say about PIII diode placement (http://www.intel.com/design/pentiumiii/xeon/applnots/24509801.pdf). With P4s and Athlons the diode is no longer in the hottest part of the chip. A little more reading (http://www.intel.com/update/departments/initech/it04021.pdf) from Intel on the subject. We have the same problems measuring temperatures inside the core when the diode is not in the hot spot as those outlined in Why Many Thermal Measurements Are Not Valid.
The only accurate CPU temperature measurements are from PII or PIII internal diodes provided you have a motherboard that can read the internal diode. There is no way for the end user to get an accurate temperature reading from an AMD CPU or a P4.
11-20-03, 11:33 AM
Interesting bit about replacing wire with exact same length. This might be an issue with very long, and precisely calibrated probes, but for this purpose, it's overkill.
Also, I'm interested to hear your impression of the Super Flower controller after some usage.
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