Core Duo

Is there a significant difference between an Intel Pentium D and Core Duo?
I have the opportunity to buy a computer with a Pentium D 3.0 or I can pay more $ 100 more for a Core Duo installed. Is there a significant difference between the two models if I intend to play games like Titan Quest and Hellgate London?
I learned the hard way that there is a big difference. I would pay $ 100 more. I a new system I built. I chose the Pentium D because it was cheaper. Open a surcharge may be glad you did.
Wild Marmalade “Core Duo”