>That's why I asked him for evidence regarding the "Tegra 1" part of his claim specifically.

Its is questionable. The performance of an older ARM design may not perform as well as even a relatively low end PPC. Later ARM design, as your figure pointed out, clearly would be competitive.

While I find Zylesea's argument for a low end PPC system somewhat unappealing, I don't think a Tegra1 would be preferable. I not even sure that focusing on the Cortex A9 is wise with the A15 coming soon.

I know I keep beating on this same drum, but there is never too much CPU power. If we are to replace our PPCs (which perform more then adequately), we should aim higher. Cortex A9 would be a bare minimum. They're cheap.