Yes i agree I believe there is no rime or reason but we all hope to try and find one. i feel it is like playing cards it's better to try to win then not care and loose all the time.
from intel
Variation and Statistical Designs
Q2: Is it strange to think of transistors not behaving consistently?
No, because we see variation today. For example, if you take a thousand samples of Intel® Pentium® 4 processors, there is some speed variation from chip to chip. Some high-speed ones, some low-speed ones, some average ones, all in a nice Gaussian distribution. The highest bin is the 3 Ghz chips, the middle is 2.8, and the bottom ones go to other uses. My number one goal is to make sure that everything can go into that highest bin, in spite of variations.
In the future, a chip will have millions, if not billions of transistors. Each transistor has a probability of meeting the performance target. In the past, the spread of this probability was very small. But in the future, due to variability in individual transistors, the whole chip could yield different results.
Think of this analogy. If piston sizes in car engines came with variability, then the cars that were produced would show variation in performance. The Mustang* that you could buy might have a 5-liter engine, for instance. But some of those engines would have roughly 220 horsepower, and some would have around 280 horsepower. You as a consumer would not be happy.
