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#21
It's almost always due to supply and demand. Also Dual Core and Core 2 Duo are different technologies. Also, you will notice that your Front Speed Bus is 1600MHz as opposed to 800MHz will allow you to enjoy FSB 1:1 ratio with your RAM assuming you have a newer system.
A CPU can be a Core Duo with 2 cores, or it can be a Core 2 Duo with 2 cores. They are both dual core but the primary the difference is the micro-architecture when it comes to FSB.