Firewire chipset - imac middle 2011

hey guys,
plz help.
i need an info about Chipset of Firewire. (imac middle 2011)
manufacturer + model
thnx in advance!

Power nap is not for iMacs, its just the for the 2011 MacBook Air or better, or one of the new 2012 Retina MacBook Pros.

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