The G5 was a disaster for apple. The worst performance per watt of any CPU they'd ever used at that point.
Not true, the late G4s were worse than the late G5s.
Given that one of apple's then long running claimed benefits over "hot, power hungry x86 processors", releasing dual processor, water-cooled CPU machines with over 60W per CPU, the G5 was an embarrassment to them.
They were competitive with x86 at the time, AMD was topping out at 125W, Intel were topping out at 150W. The 2.7GHz G5 was closer to AMD.
They'd promised 3GHz but couldn't manage it.
IBM got pretty close at 2.7GHz, Intel were quoting 5GHz at the time and got nowhere near it.
They promised lower power, cooler workstations and couldn't manage it. Meanwhile, x86 continued to get faster and less power hungry the entire time.
See above, IBM were quite competitive.
And it was the smartest move he ever made. As much as I like PPC, and I do like it, it just cannot compete with current x86/AMD64 based architectures.
Not on performance, not on power consumption, not on cost and not on any permutation of the three. Whatever your CPU needs, there are faster, cooler, lower power and cheaper x86 parts available.
Erm, look at POWER7, it's the fastest processor you can buy at the moment (the POWER CPUs have been PPC since POWER2)
At the other end there's the embedded PPCs, Intel aren't even close to those on performance/watt.
As for cost, this is determined by the size of the chip - the G5 was small, so small in fact they had problems cooling it - that's why they had to use water cooling.
Which is why this G5 v PA6T pissing contest that you are so happily engaging in is a bit of a joke, really. The PA6T may be newer, perform better per watt and depending on which source you believe, better per MHz than the G5. The G5 may clock higher and ultimately perform faster, but whichever way you look at it, they are both obsolete. Thoroughly and utterly.
In absolute terms yes, however if you are trying to argue they are using an old architecture you should be aware the Core i7 is based on an architecture that goes back to the mid 90s. AMD is remarkably similar.
Last time I looked, there wasn't really any Amiga specific software in existence that really needs the horsepower that even these old processors can deliver.
So, they're obsolete and not very powerful - but you don't don't need them because they're too powerful?