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We have an iMac with v10.5.8 2 GHZ intel core dual 1 GB int memory 512/512 667 MHz DDR2 SDRAM

Can we upgrade to just Snow Leopard, or can we go to Lion?

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Why do you look at the lion specification? – Anarko_Bizounours Aug 17 '12 at 14:38
-1 This question does not show any research effort. » Support » Mac » OS X Lion » Installation and Recovery » "To use Lion, make sure your computer has the following: Mac computer with an Intel Core 2 Duo, Core i3, Core i5, Core i7, or Xeon processor" – Daniel Beck Aug 17 '12 at 14:38

Because intel core duo has no x64 abilities you can only use osx snow leopard. Lion and Mountain Lion requires an x64 CPU.

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