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<blockquote data-quote="MacsWork" data-source="post: 1306700" data-attributes="member: 11094">Upgrade significance:10.5.x first release that supports both architectures from same disc. Though 10.4.x supported intel platform. users could not purchase it after market. Only on new Macs that shipped with intel versions of 10.4. The second step of the transition away from PPC.10.6.x first release that only supports intel architecture.10.7.x first release that does not support PPC binaries. The final step from PPC.Be sure all your critical apps are universal binaries before moving to Lion. Hence they won't work post update.RAM is very inexpensive these days. I would also get the 4GB upgrade. I've seen it as low as $36 on NewEgg. Usually in the $43-50 range.Since the processor is dual core the memory banks are tied to the processor channels. To maximize the RAM and CPU capabilities always install RAM in matching pairs that coincide with CPU channels. Since there are only tho slots in the iMac this is pretty foolproof. The Mac Pros have several more memory banks and installation of matching pairs is more of a concern.</blockquote>

[QUOTE="MacsWork, post: 1306700, member: 11094"] Upgrade significance: 10.5.x first release that supports both architectures from same disc. Though 10.4.x supported intel platform. users could not purchase it after market. Only on new Macs that shipped with intel versions of 10.4. The second step of the transition away from PPC. 10.6.x first release that only supports intel architecture. 10.7.x first release that does not support PPC binaries. The final step from PPC. Be sure all your critical apps are universal binaries before moving to Lion. Hence they won't work post update. RAM is very inexpensive these days. I would also get the 4GB upgrade. I've seen it as low as $36 on NewEgg. Usually in the $43-50 range. Since the processor is dual core the memory banks are tied to the processor channels. To maximize the RAM and CPU capabilities always install RAM in matching pairs that coincide with CPU channels. Since there are only tho slots in the iMac this is pretty foolproof. The Mac Pros have several more memory banks and installation of matching pairs is more of a concern. [/QUOTE]

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