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Sep 21, 2015 6:15 PM in response to de scby Niel,All 2007 and newer Macs have a 64-bit processor.
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Sep 21, 2015 6:20 PM in response to de scby ckuan,Yosemite is 64 Bit, so your Mac is 64 Bit (it can also run supported 32 Bit apps)