I just upgraded from a Dual 2.7 G5 with 6GB RAM to the Mac Pro 8-core 2.93GHz with 16GB RAM, ATI Radeon 4870. I had a render that took 1 Hour, 1 Min on the G5. The same render on the Mac Pro took 3 Min, 58 seconds. All the benchmarking and arguing over specs between machines are irrelevant to me when I see a result like this. Granted, this is a comparison between two very different machines, but it is pretty stunning to me.