There is a lower limit on which it will install David - and that's Intel Core2 Duo.
This is a guide:
Quote:
System Requirements
Your Mac system should have an Intel Core 2 Duo or later processor. If you are sceptical about this, you can perform a small check by going to Apple Menu-> ‘About This Mac’. Apple’s introduction of Core 2 Duo processor in their system had taken place in the year 2006. So machines released since late 2006 are 100% compatible for OS X Lion. Next important thing is, if you are still using the old OS X 10.5 Leopard version you need to upgrade it to 10.6(Snow Leopard) via software update.
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Worth it? For thirty bucks (as long as you're already on Snow Leopard) you bet it is. For such a comprehensive overhaul and feature upgrade of an O/S, this is truly incredible pricing. Microsoft charges WAY too much for 7.