Will a MacPro3,1 with a 64-bit CPU address more than 4GB on Leopard, or does one have to upgrade to Snow Leopard?
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How much RAM will 10.5.8 Leopard address?
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OS X Leopard supports 4GB RAM per processor core. Your Mac Pro supports up to 32GB. Leopard has no 4GB limitation. Windows 32 bit has a limitation of 4gig but OS X doesn't