Hell has frozen over
nick at byu.edu
Mon Jun 6 14:37:02 MDT 2005
On Monday 06 June 2005 01:55 pm, Mitch Anderson wrote:
> from my reading, its doubtful they would have used the cell anyway.
> (atleast not as the main processor in a future powerpc) altho it is
> possible to still use it as a graphics render/coprocessor as Jobs had in
> his NeXT days. My understanding of the Cell, while based on PPC, is
> still different enough that its not just a simple recompile. Apple's to
> dependant on the AltiVec and the Cell's relatively weak in that
The cell is not 'relatively weak' in that department. That is the exact
department in which the cell is extraordinarily powerful. Each cell contains
8 APUs. Each APU is itself an independent 128bit vector processor (and each
has a whopping 128 registers--compare that to the resources available in cpus
with AltiVec (32) or MMX/SSE (far fewer even)). And they run at 4.6GHz.
A dual cpu system with quad cores would be required to even come close to the
performance of a _single_ cell cpu. Worse, the 8 cores are sharing
synchronous memory w/memory protection whereas the 8 APUs have no memory
protections to slow them down and can run completely asynchronously w/o
bumping into each other on the bus.
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