Seewhy:
<<Let's say AMD introduce 1.5 Gig Athlon today, which has to be limited in quantity because of the yield. How much can they charge for 1.33??>>
In this scenario, I would say that the 1.5GHz CPU is not ready to be shipped. Why not? Because there's not enough bin split at 1.5GHz to allow it to be released. If you are only getting a few parts, then the product is not ready to be shipped. This is what I've been trying to say all along.
Bremen (on the subject of chips slowing down with time):
<<How much of a concern is this, and how fast does it happen? I've been under the impression silicon is mostly forever>>
It's an effect mostly caused by hot-electron gate impact ionization (AKA "hot-e". Hot-e gradually leads to increased Vt (threshold voltage, the voltage level that causes a transistor to turn on), and so waveforms need to reach a higher threshold before they are considered "on". Since this threshold takes longer to achieve, the transistor is effectively slower. Contrary to common sense, the "hot" in "hot-e" doesn't refer to temperature but to electron energy level.
The specifics of time vs. effect are probably confidential (as well as very process dependent), but I will say that it occurs at any voltage, but the effect becomes substantially more pronounced as the voltage increases (since the electrons have more energy) and thus the problem slows down chips that are run at higher voltage much more quickly than those at lower ones.
And chips definitely do not last forever if you run them. OTOH, if they are sitting on a shelf in a hermetically sealed, humidity controlled, temperature controlled, non-oxygen, low-radiation environment, then they probably will last an extremely long time - like hundreds of thousands of years. Silicon chips are essentially crystals. If you subject a crystal to stress, it will eventually fall apart. If you leave it alone, it will pretty much last 'forever'.
<<Oh, and I find it hard to believe that in the 5 months? since the P4 was introduced that Intel has been unable to produce a faster version. The thing was designed to easily scale the MHz ladder... >>
That's what the press said about it. But the truth is that it's the same problem as it has always been. A 15% frequency increase on a Pentium 4 is the same level of difficulty that it was on the original 486. They are both CMOS process devices and they obey the same rules. The transistors are smaller, but they basically behave the same. If you want to increase the frequency, then it's the same level of difficulty.
So you really think that Intel is sitting on a 1.7GHz Pentium 4? That they could release it, but aren't for no real reason? I guess we are back into this discussion again, but (no offense intended) I'm actually having a problem understanding why this scenario makes any sense at all to you.
<<Let's say AMD introduce 1.5 Gig Athlon today, which has to be limited in quantity because of the yield. How much can they charge for 1.33??>>
In this scenario, I would say that the 1.5GHz CPU is not ready to be shipped. Why not? Because there's not enough bin split at 1.5GHz to allow it to be released. If you are only getting a few parts, then the product is not ready to be shipped. This is what I've been trying to say all along.
Bremen (on the subject of chips slowing down with time):
<<How much of a concern is this, and how fast does it happen? I've been under the impression silicon is mostly forever>>
It's an effect mostly caused by hot-electron gate impact ionization (AKA "hot-e". Hot-e gradually leads to increased Vt (threshold voltage, the voltage level that causes a transistor to turn on), and so waveforms need to reach a higher threshold before they are considered "on". Since this threshold takes longer to achieve, the transistor is effectively slower. Contrary to common sense, the "hot" in "hot-e" doesn't refer to temperature but to electron energy level.
The specifics of time vs. effect are probably confidential (as well as very process dependent), but I will say that it occurs at any voltage, but the effect becomes substantially more pronounced as the voltage increases (since the electrons have more energy) and thus the problem slows down chips that are run at higher voltage much more quickly than those at lower ones.
And chips definitely do not last forever if you run them. OTOH, if they are sitting on a shelf in a hermetically sealed, humidity controlled, temperature controlled, non-oxygen, low-radiation environment, then they probably will last an extremely long time - like hundreds of thousands of years. Silicon chips are essentially crystals. If you subject a crystal to stress, it will eventually fall apart. If you leave it alone, it will pretty much last 'forever'.
<<Oh, and I find it hard to believe that in the 5 months? since the P4 was introduced that Intel has been unable to produce a faster version. The thing was designed to easily scale the MHz ladder... >>
That's what the press said about it. But the truth is that it's the same problem as it has always been. A 15% frequency increase on a Pentium 4 is the same level of difficulty that it was on the original 486. They are both CMOS process devices and they obey the same rules. The transistors are smaller, but they basically behave the same. If you want to increase the frequency, then it's the same level of difficulty.
So you really think that Intel is sitting on a 1.7GHz Pentium 4? That they could release it, but aren't for no real reason? I guess we are back into this discussion again, but (no offense intended) I'm actually having a problem understanding why this scenario makes any sense at all to you.