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Core 2 Duo is on the way out of
market, it's being replaced by Core i3, i5, i7
processors
The higher the number in Core iX, the faster it is,
which means Core i7 is faster than Core i5, Core i5 is
faster than Core i3
But don't just assume that all Core i5 will be better
than Core i3, the cheapest Core i5 might not be better
than the best Core i3. Comparing the GHz figure will
help you choose between these Core i3,5,7 processors as
well.
In Windows, open Task Manager, click Performance, under
CPU Usage History, a Core 2 Duo processor will show 2
windows, a Core i3 will show 4 windows. This tell you
that there are 4 cores in Core i3 comparing 2 cores in
Core 2 Duo processor.
So when you're looking for a new laptop, if you can
afford, go for a Core i-3,5,7 processor.
More details and specs of
these new Core i-3,5,7 can be found here:
http://www.intel.com/products/laptop/processors/index.htm?iid=note_nav+proc
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