For starters, a fair share of the new MacBook's circuitry comes from Nvidia instead of Intel. Most notably the 9400M integrated graphics, which is a big step up from the Intel X3100 found in the white MacBook. Apple claims it has five times the performance over the Intel IGP, but in the real world the difference is actually even more significant - the 9400M lets you to play some recent games whereas the old and tired Intel X3100 certainly does not.
