Intel Compared to Sun M-Series

Hi All,
Does anyone know if the Intel Westmere Processors are more performant compared 
to the ones used by Sun M-Series Servers (Sparc VII?). I know the Westmere 
starts at 6 core, where as the M series (or Sparc) are 4 core - I'm interested 
in a core to core comparison - if anyone is aware of one? Or has some comments 
along the same.
Thanks
Matt

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