Re: Why doesn't anybody mention the fact that 45nm yields are bad , really bad ?
Because it isn't true.
Intel has been ramping servers and mobile at the expense of desktop, because servers and mobile are higher margin businesses. 45nm products were only just released at the end of Q4, and in one quarter, Intel already crossed over on server shipments, and their output has grown to 0.5M processors per week.
Furthermore, they still expect to cross over capacity in Q3, which is at or ahead of their usual schedules.
Re: Intel's double patterning requires the wafer to be process twice , the second time being mechanically repositioned.That is a recipe for disaster.
Yet at the same time, they've reduced wafer throughput from 90 days to 45 days.
Re: Yields must be horrible if 1 1/2 FABs ( D1D + FAB 32 ) managed to produce only 10m 45nm CPUs in 6 months.
That's what happens at the beginning of a ramp. Even if you could do a hard toggle of wafer starts (which isn't possible due to needing to qualify all the new machines at each new node), you still wouldn't want to toggle if you can help it. The defects on a brand new process are indeed going to be higher, and taking 6-9 months to optimize the process increases margins. This is congruent with Intel's strategy to ramp server and mobile first, since these segments have higher ASPs to offset the process ramp costs.
AMD has the same issues, but they will toggle hard anyway, just to close their competitive gaps. Their hard 65nm toggle affected margins in H1 2007 pretty badly, affecting their stock price. Intel has the luxury of a competitive 65nm product line, so they can ramp at a pace that will maximize margins.
Re: To achieve crossover with 65nm in Q3 , they need to ramp 45nm to about 2m parts per week .How exactly will they manage that considering that FAB 28 is supposed to come online June 29th ( at least a Q delay ) ?
They don't need another fab to hit this target. They can get 2M parts out of one fab, if they wanted, and depending on the mix of products. Yield is not the limiter, and if it were, you'd see a pretty big impact on margins, or a big slowdown in other segments. As it is, the shortages are in desktop only, or in segments where demand has significantly outstripped supply (in the case of Atom, for example). But then, high demand is a nice problem for Intel to have right now.