If you guys are referencing the more recent chart
GTX 580 is showing to usually be 20% or more (usually more) faster than GTX 480 in the following benchmarks
Batman Arkham Asylum
Just Cause 2
Alien Vs Predator
Battlefield Bad Company 2
Lost Planet 2
It's only less than 20% or more faster in the following;
Resident Evil 5
World in Conflict
Please Re-read the chart, look at the data not the length of the bars Each line up is a 20% boost over the other card
Now granted all of these charts could be canned and some are obviously Synthetic (Vantage, Stone Giant, Heaven) to name a few, but man in other forums they are laughing and saying that most of you guys can't read the charts.
Lol like I said in the other thread you posted this...wrong math. Recheck.