Dude that makes absolutely no sense. Yonah and Merom are the SAME price. Same. Why would Apple not use the better chip especially if they're the SAME price. And plus every other PC manufacturer is going to use Merom over Yonah. And Apple will stay with Yonah just to differentiate between product lines? Sure buddy.
If anything it'll be a clockspeed difference and L2 cache size.
If anything it'll be a clockspeed difference and L2 cache size.