cell is a cpu? and g80 is a gpu? or am i mistaken
like apples to oranges isn't it ?

yea so it can ratrace, but can it do that WHILST controlling AI, PHYSX and everything else the CPU looks after?
no.
and 16,000 AMD Opteron Linux only gives 6 of the 8 SPE and no use of the GFX, so a proper game would have another 6 SPE and 3 gfx cards to use in this way potentially
I thought that out of the 8 SPE's 1 is redundant and one is always reserved for the OS, restricting the actual number available to games to 6 per console.