I did the cinebench test and I'm only getting 5000 when I understand I should be getting closer to 5500. It's a late '08 2.4. Now, I don't know how I would get this fixed by Apple. I don't think I could just walk in and say "cinebench is giving too low of a score, replace it". What could I do? Is there any official way I could prove that the card is defective?