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Motherboard temp goes down when running Orthos

post #1 of 2
Thread Starter 
Curious situation... A new system: Gigabyte P35 DS3P - bios F9, E8400 - 3GHz, Gigabyte 8800GT graphics, Antec Sonata Solo, Neopower 650W, 2GB Corsair XMS2. Stock CPU cooler, 120mm Rear case fan, 2 x 80mm front case fans. Haven't tried overclocking yet but running tests to check temp. Using speedfan 4.34 beta 38 (the one that supposed to support the new Intel CPUs).

While Windows XP has been sitting idle for a while, Speedfan reports the following:
Temp 1 - 37
Temp 2 - 31
Core 0 - 44
Core 1 - 44

From other threads I have assumed (I know its bad to assume) Temp 1 means 'Motherboard' and Temp 2 means CPU case, and Cores are the individual CPU cores. Now when I run Orthos for a while (20mins) with just CPU stress test the temps are:

Temp 1 - 35
Temp 2 - 54
Core 0 - 65
Core 1 - 65

Any ideas why Temp 1 go down (37 to 35) instead of up? Does anyone know where the temp sensor is for Temp 1 on this motherboard? (e.g. is it on the Northbridge or hiding under the CPU socket???).

My theory would be that the sensor is away from the actual CPU (which is getting hot) but wherever the Temp 1 sensor is, is that it is not close to anything getting hotter by this particular test and that it is being influenced by increased airflow from the CPU fan (which is increasing in speed due to CPU temp rise).

Anyway, open to other theories and to (hopefully) answer where the Temp 1 sensor is hiding. Gigabyte motherboard manual is very 'light on' when it comes to details like this.
Main System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E3120 GA-P35-DS3P Rev 2.1 GV-N26OC-896H 4GB Corsair Dominator 1066 
Hard DriveOptical DriveOSMonitor
WD800JD (80GB) Pioneer 215 Windows Vista Ultimate 64bit Samsung 2493HM 24" 
KeyboardPowerCaseMouse
Dell wireless Antec Neopower 650W CoolerMaster HAF932 Dell wireless 
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Main System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E3120 GA-P35-DS3P Rev 2.1 GV-N26OC-896H 4GB Corsair Dominator 1066 
Hard DriveOptical DriveOSMonitor
WD800JD (80GB) Pioneer 215 Windows Vista Ultimate 64bit Samsung 2493HM 24" 
KeyboardPowerCaseMouse
Dell wireless Antec Neopower 650W CoolerMaster HAF932 Dell wireless 
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post #2 of 2
First I would like to say I do not like SpeedFan nor do I trust what it says, it never seems to work correctly for me. (CoreTemp for me) I also like Everest but that is a Payware.

Does the motherboard temp go up and then go back down? If so then I would say that the fan comes on 100% when the temp goes up a little, and stays on for a while so it cools it down. (Just a Guess)

I am sorry but I have no idea where the temperature sensor is on the mb. Maybe someone will chime in with exp on your board.

P.S. Fill in your computer specs because it is easier to read. Just click UserCP at the top of the page.
Gaming
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k ASUS P8Z68-V Pro EVGA GTX 460 G-Skill Ripjaws X 2x4GB 
Hard DriveOSMonitorPower
WD 320GB 7200RPM Windows 7 x64 HP w2007 Silverstone DA750 
Case
Antec 900 
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Gaming
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k ASUS P8Z68-V Pro EVGA GTX 460 G-Skill Ripjaws X 2x4GB 
Hard DriveOSMonitorPower
WD 320GB 7200RPM Windows 7 x64 HP w2007 Silverstone DA750 
Case
Antec 900 
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