4 Is More Than 2 ......
 

Most attention, too much attention, has been focused on quad-core processors. Yet if you asked most people why they wanted/needed a quadcore, their answer would boil down to "Because 4 is more than 2."

http://overclockers.com/tips01261/

4 is more than 2 but it costs a lot less than 2x2


If similar clocked and cached dualcores would cost half as much, it would be worth bothering not to get a Quad.