i don't think it's that far off the mark. Some GPUs will be stronger in some areas than others. It's based off benchmark results rather than an argument down the pub. 
Keep in mind that the comparisons may be influenced by CPU. G4 vs Core i7 is an unfair matchup which may slightly skew the results in some tests. Notebookcheck.net list many mobile GPUs in a similar way if you'd like another source? I haven't checked it ... so this might get embarrassing.
Keep in mind that the comparisons may be influenced by CPU. G4 vs Core i7 is an unfair matchup which may slightly skew the results in some tests. Notebookcheck.net list many mobile GPUs in a similar way if you'd like another source? I haven't checked it ... so this might get embarrassing.