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there were 4 generations, topping out at 2.0, 2.5, 2.7, and 2.5 (quad) respectively. So yours is most certainly a second gen. G5. 😉 Anyway, those are some pretty wild photos, but I'm glad you're getting it taken care of free of charge.

Wasn't there 5? 2.0, 2.3, 2.5, 2.7 and 2.5 Quad.
 
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