The older Pentium D (2006) were called "dual core" but they are vastly inferior to the current Core 2 Duo (2007) also from Intel. I own both Pentium D and an E6600 series Core 2 Duo with 4 Mb cache. Of course Core 2 Quad owns them both.
For server go dual core opteron or better.
For home PC go core duo Intel.
They are different CPUs designed for different kind of work. You can drive very good a database on an opteron box, but you will have better peformance in games, office and any other home applications with a core duo.
there are some different exact lingo used
that can be potentially confusing or misleading
as the technogoly and products have been
progressively developed and improved they have
used slight variations of terminology in reference
to them, so be careful and compare the specs.
core 2 duo is newer and better than core duo (without the 2)
so there will be like other exact names used later when they go to 4 and so on, etc.
compare specs like I said
and look at model numbers of chips too
not just the most general name it has
like T7200 is a core 2 duo like I have
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