Mac Pro 2009 - Where are the northbridge-chips?

Discussion in 'Mac Pro' started by FFder1., Jun 12, 2011.

  1. FFder1. macrumors newbie

    Feb 10, 2008
    i am an owner of a 2009 Mac Pro (2x2.26, 4.1).
    Because i am a friend of cool systems, I changed my graphic card fan and added an active cooling system for my RAM. The only hot parts of my Mac are still this mysterious northbridge chips (with ca. 70 °C).

    So is my questions: Where are this Northbride chips?
    A simple picture would be awesome.
    I ´ve recently read many debates about the heat of the Northbridge, but nobody wrote, where there are. So I don´t want to start a new thread concerning the topic, how hot the northbridge chips should be.
  2. 666sheep macrumors 68040


    Dec 7, 2009
  3. nanofrog macrumors G4

    May 6, 2008
    It's located on the daughter board under the heatsink next to the CPU socket/between the sockets on a DP version (same board the CPU/s reside on). See pics in link above.

    BTW, It's not really a Northbridge any longer, as the memory controller is now located in the CPU itself. The chipset contains the PCIe lanes and communicates with other parts on the board via a DMI (i.e. ICH = SATA, USB, Ethernet, PCI,...; PCI bus is used to communicate with other components not contained in the ICH itself, such as the Firewire controller).

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