FSB 1066 vs 1333, DDR2 800 vs DDR3 1333 - DDR2 - Memory
The C2D processors aren't really FSB bottlenecked so the increase from 1066 to 1333 is only a few percent for a like CPU comparison. Example: E6700 vs E6750 - Both run at 2.6G and won't be a very noticable increase. You will get a larger and more noticabl...