Look at the official ETS GRE practice manual (10th ed.) for more info on the paper scoring.
Thanks for all the responses. I've looked at the ETS GRE Practice Manual (10th ed) and it shows score breakdown for exams before 1992. Can miss 1-3 and still receive 800.
However, that's 1992 and before. Was wondering if anyone could look up the practice paper exam that you get when you sign up for GRE (not the Powerprep CD) ... and let me know what the composite scores to get 800 for Quantitative. I don't have that on me right now.