Click on the bitten apple on the very top left of your desktop/then click on "About This Mac"/then click on "More Info...
This will give you the version #.
The 1st gen macbooks only had a 1 core processor.
The 2nd had a Dual core 2GB processor w/512 MB RAM and the current ones have either a Dual core 2.16 or a Dual core 2 GB processor w/1 GB. Or something like that.
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