In truth, I would say that some graphical PS3 games are possible on the Xbox 360. The RSX is only slightly technically better that the Xbox 360's Xenos when you look at the specifications.
When you look at the PS3, however, you also get the Cell.
Compared to the Xbox 360's Triple cores (called Xenon) clocked at 3.2 GHz, the PS3's cell has one main core (the PPE) clocked at 3.2 GHz, along with 7(1 core is reserved for the OS, while 6 are available to developers) other sub cores (the SPE's) also clocked at 3.2 GHz.
How the whole cell works (I think) is like this:
The PPE core sends out information to any of the 6 SPE cores it has available. The SPE then processes the information, and sends it back to the PPE core.
Because of this, it is sort of like the PS3 has 7 cores for physics in video games. The cell is quite powerful for in terms of physics processing. This is sort of how the cell alone can emulate PS1 games.
The reason cows probably say this is in terms of physics, rather. While I would say that MGS4 graphics could be done on the Xbox 360, there are physics elements that the Xbox 360's Xenon might have problems with.
Take Shadow Moses for example. While the textures and details could most likely be recreated on the Xenos, the Xenon might have difficulty processing the blizzard effect, the snow on Snake's body, enemy AI, and occasionally explosions... at the same time.
In short, I would say that games could be done on both PS3 and Xbox 360 graphically, but in terms of physics, the PS3 has a better chance.
If the cell could also process graphics, however, that would be a different story...
I'll bet this post is riddled with mistakes. If you do find some, please tell me, but don't turn it into a flame.
qman101
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