Fans activated by memory control temp, not CPU

Discussion in 'MacBook Pro' started by iDive, Jun 30, 2007.

  1. iDive macrumors member

    Jun 15, 2007
    I've been observing my SR MPB for the last few days, and I noticed that my fans are activated by high memory control temperatures, not CPU temperatures. Right now I have firefox and word open, the CPU temperature is 42C and the memory control is 60C, the fans are spinning at 4000 RPM.

    A few minutes ago the situation was the opposite, I was ripping a DVD, the CPU was at 62, the memory at 52 and the fans at 2000 RPM. I think that's where all the complaints of people scared about high CPU temps and low fan RPM are coming from. People freak out when they see a relatively high CPU temp with a low fan speed. I noticed that with a low memory temperature, my fans only speed up when the CPU goes over 65C.
  2. killerrobot macrumors 68020


    Jun 7, 2007
    Good observation. I'm using a 17" Merom (close enough to SR in my book) and I'll keep a look on my memory temp from now on and see if that's the main cause of my fans and see if I can add anything to this conversation. (Right now CPU is 57ºC, memory at 46ºC and fans are idling at 2000).
  3. chem macrumors regular

    Jun 9, 2007
    If the OP is correct, that's a pretty insightful observation. Also kinda wacky.

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