In all seriousness, I wouldn't try and derive a single % increase across the board. Some people are going to see some incredible frame rates in some areas, and some just barely better in others. People who are GPU-bound are going to see very little increase, for example, when they're in areas with tons of shadows and particles. However, most people should see significant improvements in the areas where the game gets bogged down on Live. Really I'm looking forward to looking at how it does when you're in a 400+ soldier fight with tons of vehicles!