Well he quoted what you wrote, so your saying what your wrote was wrong? I agree ;)


But to the question:

Back in the day when the X1000 was new it could barely hold up against a similar clocked G4 in most benchmark. Even those really old ones with SDRAM like a QuickSilver PowerMac.

In theory the X systems should be faster due to better RAM standards but the X1000 completely fails to utilize that speed and neither is the X5000 which also lacks Altivec crippling it many intensive task.

G5 isn't much faster then G4 clock by clock but it goes higher and can utilize it's faster RAM so yeah in terms of compute anything G5 is still king.
X systems should consumer less energy but with the insane cost of entry that will never word out financially even with current prices.

If you want the top in GPU X and PCIe PMAC_G5s are on the same level.