Puddle Jumper
Mod Emeritus
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It didn't make sense because Nehalem was already under development. Though a monolithic die without an IMC would have been a lot easier.
Again, logistically it would have been very bad for Nehalem to be produced on 65nm. And in a lot of ways, Nehalem is like Phenom.
Core 2 wasn't developed quickly. It just appeared on the market suddenly, and surprised people.
It was a fairly smooth transition from the Core Duo's (the first generation "core" chips), which were a fairly smooth transition from Pentium M's.
They wouldn't have wanted people to have a very advanced warning that a new CPU was coming out. that would have prematurely killed Pentium 4 sales a lot before the Core 2 would have even come out.
It would have been pointless for them to release two new architectures at 65nm and nehalem was far from ready at that point.
Core 2 may not have been announced much before it's launch but it was hardly the direction Intel intended to take. If you look at their older roadmaps you can see that there were more versions of the netbourst architecture planned after cedar mill but AMD's superior Alon 64's and athlon x2's fored them to develop a competitive product