I'm trying to figure out the speed/performance difference between the Mid 2010 Macbook pro 15" (2.66 i7) and the current Late 2011 15" Macbook Pro. The specs of the mid 2010 model I want to compare are: 15" 1440x900 screen 2.66Ghz dual core i7 CPU 4GB 1067mhz DDR3 ram NVIDIA GeForce GT 330M 512 MB GPU I would like to know the speed/performance difference between that one and the current low end 15" model which specs are: 15" 1440x900 screen 2.2Ghz quad core i7 CPU 4GB 1333mhz DDR3 ram AMD Radeon HD 6750M 512MB GPU Since the screens are the same and the RAM and HDD are user changeable, the main things to compare are the CPU and GPU. So basically the question is whether the low end late 2011 model is a step up from the mid 2010 model in terms of speed/performance? Is the 2.2ghz quad core i7 faster/much faster than the 2.66ghz dual core i7? If so, how much? And is the AMD Radeon HD 6750M 512MB gpu faster/better than the NVIDIA GEFORCE GT 330M 512mb GPU? If so, how much faster/better? Can anybody help me out with this? Thanks.