MacBook a1286 Mid 2009 Processor include Northebridge
In this model, the "Northbridge" chip is included in the processor chip?
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Your MacBook Pro uses a different architecture than using a North and South Bridge chips which is often used in desktop systems at the time.
Here a more integrated solution was used based on a Platform Controller Hub (PCH) chip In your system it also included the dedicated GPU from NVIDIA (nForce PCH)
And here’s a breakdown in a block diagram on the layout
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