Shifty Geezer said:[/B]
Though that is true. From what we know of the first XB360 kit, it had an ATi 9800 GPU. That alone is a fraction of the GPU performance of Xenos. The CPU too didn't have the vector power of XeCPU, so was much weaker in that respect. PS3's kit, the earliest I know of, had 6800s (were these SLI'd?) which were much closer to final GPU performance than 9800 is to Xenos, and a Cell (2.4 GHz I think) that had the same level of performance, just underclocked.
Yes 360 Alpha kits had X800s(some had 9800s) and dual G5s. PS3 Alphas had SLied 6800s w/ 2.4 Ghz Cell. Not only were the PS3 alpha kits a lot more similar to final performance, but they were also more similar in architecture as you've stated. This is no slight to the PS3's power like some f@nboys here are trying to think, two 6800s being 70% the power of your one card solution is crazy powerful. But in comparision the 360s Alpha kits were so weak, I find it pointless when people try and compare the 360's E3 games against PS3's tech demos considering the vast difference between each systems alpha kits and what their final performances will be.