mac box or ibm clone

Hello all Has anyone compared SuSE linux performance on a mac architecture versus a PC(IBM clone)architecture? I'm just curious if there is any difference in speed if comparable machines were used.Assuming the two types can be compared.But we've all seen benchmark tests with each of their "native" OS's . I friend of mine gave me 6.4 for power PC and I've got and old 7600 laying around. So i think I'll give it a try.Any comments would we be extremely appreciated ‹