PPC vs x86 speed/performance comparions?

[mingle]

Hi,

I understand that since the old PPC were RISC chips, they outperformed equivalent clockspeed x86 CPUs...

Is this true?

Would a 1GHz G4 PPC be the same as, or faster than a 1GHz PIII?

How do each of the PPC processor generations (G3, G4, G5) correspond to the rival x86 families (PII, PIII, PIV, etc)?

Cheers,

Mike.

[mingle]

Okay, I understand that MHz isn't a good benchmark...

What I'm getting at is how they compare, ie: MIPs/ Dhrystones/ Real World performance...

If I have a 1.8GHz G5 Mac and a 2.0GHz P4, running the same OS (Say a flavour of Linux), which would yield better performance?