Does the low end MBP i.e the 2.2 GHz one have : (a) santa rosa chip? (b) 800 Mhz FSB? am i right? In everyones experience, running which applications will I feel a perceptible difference between this chip and the older C2D 667 FSB chip ? eg. photoshop? mathematica? Also, the MBP is upgradable to 4Gb Ram but the MB to 2 or 3 Gb. am i right?