You need to do some googling. The Core 2 Duo was/is a great CPU but the Core-i series is even better. It's based on a different arhitecture that eliminates the FSB (front side bus). The memory controller is now built into the CPU rather than the motherboard, similar to how AMD has been doing for years. AMD calls the FSB replacement "HyperTransport", Intel calls it "QuickPath Interconnect".
core 2 duo and core i3 use the same architecture (core architecture) but core i3 architecture is improved. If u are using high end core 2 duo (e8400, e8500, e8600) u are not going to see bigger improvement.
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