rather unfortunate article on Mac

Richard Walsh rbw at networkcs.com
Fri Feb 1 10:17:03 EST 2002


Bari Ari wrote:

> We looked at building some very dense clusters using the G4s. The 
> floating point performance is great (15Gflops peak) as well as the raw 
> performance vs. power consumption (21watts at 1GHz). The main drawbacks are 
> price of the CPUs (though the new 7455s are only $125/10k for the 800MHz 
> versions), lack of support from Motorola and lack of any decent 
> clustering software such as Scyld.

Are those 32-bit or 64-bit flops for the peak calculation? I see 4 
vector FMA's and 1 standalone (can it chain mult and add?), so I
guess it could be 15 64-bit gflops at 1.5 GHz cycle time. That would
be:

  (4 + 1) * 2 * 1.5 = 15 gflops

Is this the correct calculation?

Regards,

rbw

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