The Playstation (original) has a 33Mhz CPU and 2MB RAM, but can manage games like Quake II and Wipeout 2097 because of its GPU.
The Playstation 2 has a 295MHz CPU and 32MB RAM.
The XBox has an 733MHz Intel CPU and 64MB RAM.
...and yet the PS2 continues to wipe the floor with the XBox because (as someone has already said) of it's huge library of high quality games.
The technical specification is therefore kind of irrelevant to success, and even if the XBox2's tech spec appears to be much better on paper than the upcoming PS3's tech spec, I can't see it making the slightest bit of difference to PS3 sales and Sony's domination of the console market.
Steve.