The E6600 is more costly because it runs on the 1066FSB, and since some of the older motherboards don't support the new E6x50 CPUs the buyers will need to buy the E6x00 CPUs if they want to use the older motherboards.
Another reason would be intel tricking people into believing the quad is faster than a dual core....and then people who buy it get disappointed and start living in denial and turn into zombies(also called fanboys)...then fanboy zombies brainwash unsuspecting young and easily led buyers into buying the q6600.
Buyer: "I'm thinking of buying E6750"
Fanboy waves his wand: "Overclocking!"
Buyer: "Ooer...4 cores...overclocks better...yes..but..games run faster in dual core.."
Fanboy: "Futureproofing!!!!"
Buyer: "I want the q6600!!"
Another reason would be intel tricking people into believing the quad is faster than a dual core....and then people who buy it get disappointed and start living in denial and turn into zombies(also called fanboys)...then fanboy zombies brainwash unsuspecting young and easily led buyers into buying the q6600.
Buyer: "I'm thinking of buying E6750"
Fanboy waves his wand: "Overclocking!"
Buyer: "Ooer...4 cores...overclocks better...yes..but..games run faster in dual core.."
Fanboy: "Futureproofing!!!!"
Buyer: "I want the q6600!!"
The E6600 has two, not four cores.
The fact is that it does not really make much sense that the older C2D are more expensive than the newer and faster ones. The newer ones have more demand and should thus be more expensive but Intel insists on charging more for the older models.
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