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Major Players on the top side of the logic board include:
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Intel Core i5 Processor-2557M with integrated Intel HD 3000 graphics
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Intel E78296 01PB10 / E116A746 SLJ4K Platform Controller Hub. We're guessing this includes an integrated Thunderbolt controller. It's not this part, but it's similar.
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Genesys Logic 822 SD-slot controller
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DSL2310 L123TA46 Eagle Ridge SFF Thunderbolt controller
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Linear Technology 3857
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Shifting to integrated graphics on the processor freed up a lot of room on the board—enough for Apple to add the sizeable Thunderbolt-capable PCH.
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If you're interested in more information on Intel's mobile chipsets, Wikipedia has a lot of interesting information.
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