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maxupgrades.com: MaxConnect SAS/SATA Link for Mac Pro [2008 / 2007 / 2006 [Model ID: 3,1 : 2,1 :1,1] Models with 4-Port Areca ARC-1213-4i SAS/SATA 6G HardWare RAID Controller with 256MB Controller Cache Buffer
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How does the original Mac Pro allocate lanes for the PCIe bus? What configurations are possible?: EveryMac.com
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