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The names are similar, but the chipset is fundamentally different, with the Core Duo being an old Pentium-M based 32 bit processor and the Core 2 Duo being a completely different 64 bit architecture.
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In fact, any Mac bought within the last 5 years should have the Core 2 Duo CPU and will be fully supported.
OS X LION 10.7 5 MAC OS X
This is important to point out: the Core 2 Duo chip is newer and fully supported by Mac OS X Lion. If you’re in this situation, Snow Leopard is $29 with free shipping from Amazon. Lion requires the App Store to install from, and thus the 10.6.6 requirement to install. If you meet the hardware aspects of the Lion system requirements, then you’ll most likely need to upgrade first to 10.6 prior to 10.7, simply because 10.6.6 is the release that the Mac App Store was included with. What about upgrading from OS X 10.5 Leopard directly to Mac OS X 10.7 Lion? Apple’s own Lion web site even touts a simple three step process to install the update once it becomes available: check Mac compatibility, update to the latest Snow Leopard, and download Lion from the App Store. The hardware requirements are surprisingly basic, but that’s good news. At least 4GB of additional disk space to accommodate the download, but more is obviously recommended.Mac OS X 10.6.6 or later with the Mac App Store installed.Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor.In order to install Mac OS X 10.7 you will need: But up until now, we didn’t know the hardware requirements. We know it will be released in July through the Mac App Store. We know it’s only $30 but a single purchase will cover installing on all of your Macs.