You made it sound like 12mb Yorkfields have the most cache...which isnt true as they have the same cache wolfdales do.
Explain to me oh mighty guru, how 6=12. Because you are discounting cores? Please. I am talking from personal experience of speed in my setup.
I loved the E8400, and it was quick, but the QX9650 bests it in both speed and multitasking.