In response to the original poster, no you cannot upgrade to an i3 or above on your current motherboard if you currently have a Core 2 Duo. The Core 2 Duo and Quad processors are on Intel's socket 775 for desktops. The more modern Intel CPU's such as the i3 are on a different socket, the most recent being 1150 for general consumers.
En total son cinco nuevos microprocesadores Core 2 Duo, y un nuevo Core 2 Extreme, el cual según Intel es el procesador de doble núcleo con mayor rendimiento del mercado según los tests SPEC
The Core Duo is a 32-bit CPU. The Core 2 Duo (and AMD Athlon X2) has 64-bit extensions. The Intel Core2 is about 10% faster than a Core Duo at the same speed. You'll find the Intels beat the AMDs at many tasks, but both are more than capable of running everything out there right now.

Browse CPUs by: Find processor by its name and/or partial specifications: You can specify any of the following: manufacturer name, family name, model number, part number, core name, microarchitecture, manufacturing process, socket name, operating frequency, bus speed, the number of cores and threads, cache size, TDP and GPU type.

Intel® Core™2 Duo Processor T8100 (3M Cache, 2.10 GHz, 800 MHz FSB) quick reference with specifications, features, and technologies.
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intel centrino duo vs core 2 duo