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M

MYST_2

Gawd
Joined
May 4, 2000
Messages
533
I got my new 2500+M and while it boots windowsw fine at 2700MHZ i'm having a hard time even keeping it stable at 2500MHZ. This pic is it running prime95 for about 10 minutes. Notice the PWM temp. I'm assuming that is the power supply? Anyway its way out of spec and set the alarm off in uguru at 70C. Anybody confirm what this is so I can cool it down. It seems to be the culprite.

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It stands for pulse width modulation. In this case, it's referring to the four or so 1/2" square, three pin chips that are located adjacent to the cpu socket area. These are used to control the voltages to the cpu and supporting circuitry. They accomplish this feat by modulating the duty cycle of a square wave analog voltage, allowing precise control through high resolution digital counters. These switching mosfets carry a lot of current, and therefore a lot of heat is generated. When over-heated, they result in unstable cpu voltages, and the oates cooler that abit uses on their ic7 boards was designed just for this part of the circuit.
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From this thread : Tweaknews.net
 
well my next question would be how to them. I have 6 case fans running already but no cpu fan because of the coolance. This chip was tested to 2600MHZ at 2.03 volts stable on another machine so i know the chip is fine. I'm also running with the multiplier set to allow 2500mhz at the 200 MHZ FSb.
 
Under normal conditions they are cooled by the air movement created by the fan on the cpu heatsink. But with some aftermarket HSF's either they dont have airflow in that area or the fan doesnt flow enough to keep them cool. And if you are water cooling then you have almost zero air movement in that area. Here is where the OTES that Abit uses on the MAX3 is very helpful. Also proper case ventilation is very important just as Nathan has been saying for some time. But nothing really replaces the cooling benefit of direct air flow to cool these parts. (well except a few people out there that have custom build water blocks for them, but that isnt always viable.)
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Small heatsink and some thermal adhesive could help.
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