That might be true of the physics simulation but I think that's more likely Intel's better vector processing resources. With a prime search the branches involv

That might be true of the physics simulation but I think that's more likely Intel's better vector processing resources. With a prime search the branches involved ought to be a combination of the trivially easy ones that any predictor should be able to handle and the super high entropy ones that no predictor can guess. So if anything doing badly on the prime test is an indication that it was AMD's good branch predictor that was bumping up its score on the other tests.