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Old 15th July, 2008, 08:53 PM
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Dual core temps

Getting set up to do some testing an thermo grease and it looks like I'll use OCCT as a CPU stresser & temp recorder with SpeedFan as back up recorder.
I noticed that each core has it's own sensor but they arn't independent of each other. If I stress both cores 100% temps go up in unison. I turn off OCCT and only 1 core is running 100% [folding]the other drops to almost zero usage but both temps fall in unison.
Why have 2 sensors? You are getting a temp that is a combination of the 2 cores. I would guess it would cost less to have 1 sensor. So why have 2?
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Old 31st January, 2009, 07:40 PM
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  1. The sensors are part of the basic design of the core. A dual-core or quad-core system replicates about 90% of the design wholesale for each core, and then adds a little glue logic to make all the cores work together.
  2. There ARE situations where one core could run hotter than the other, particularly if there were some kind of problem with the heat-sink. As a result, there really IS a need for a sensor on each core.
  3. That sensor is actually pretty cheap, because it's nothing more than a transistor running in a common-base (or, in this case, I guess it would be common-gate) configuration.
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