This change in clock speed is very important for running any software on the computer or laptop. The dual-core has lesser clock speed when compared to the core 2 duo.
So when the bus speed is high then the more data is moved and executed in the processor.
The speed at which the data moves in a bus is called bus speed and in dual-core it is more than compared to the core 2 duo. In the dual-core, the pipeline storage is more than in the core 2 duo processor. Whereas in the core 2 duo processor the CPU speed is faster which makes the core 2 duo run faster. Main Differences Between Dual Core and Core 2 Duo