The Core 2 Duo is Intel's last generation processor technology. It was the fastest mobile processor in it's time but Intel just released it's 2010 Core lineup which uses Intel's newest CPU architecture. I would definitely go for a Core i3 over the Core 2 Duo.
The Core i3 processor has Intel's next generation architecture. It is definitely faster than the Core 2 duo and has hyper-threading technology which enables 4 way processing. It is pretty fast and can play games with a powerful enough video card but many Core i3 models are more entry level and include Intel HD graphics which will limit you to mainstream games(not 3D shooters).
The Core i5 processor is based on the same Intel architecture as the Core i3 but it has additional features. . It has hyper-threading technology of course but it also includes Turbo Boost technology.
This enables your cpu to automatically speed up when you need extra performance. Thus the Core i5 while more expensive than the Core i3 processor, has more features and better performance. You are more likely to find a more powerful graphics card on Core i5 models and this processor does do a nice job for all types of gaming.
The Core i7 processor is the fastest Intel processor. It has both Turbo Boost and Hyper-threading technology and can do 8 way processing on certain models. The Core i7 is the best choice for those who want the fastest performance.
Many Core i7 based laptops are intended for 3D gaming and provide the best gaming experience. Clayton Intel Social Media Twitter: @intelinside.
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