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or how to answer "ZOMG GOLDEN CHIP???" threads with statistics.

I've made an (updated) chart showing the average Vcore for each clock speed, as well as percentiles to show where your chip may fall.
There are a few things that this may help with:
1) Starting point for OCing. Suppose you're trying for 4.8 GHz? Start with the average Vcore needed (1.403 V)
2) Understanding how good your chip is relative to others. Such as, if you reach 4.8 GHz at 1.35 V? Top 90%
I'm sure there are others.

However, a few precautions about the table:
Pay note to the sample size. The larger value for n, the better, some speeds don't have much data. These numbers are less accurate. Particularly 4.3, 4.4, and 4.9+ (5.0 GHz might be ok)
Because of the need for larger sample sizes, all chips have been grouped together. i5-2500k, i5-2550k, i7-2600k, and i7-2700k data are mixed together. Some have HT on or off. This isn't ideal, but it was a decision I made in order to increase the sample size to get better accuracy.
Cooling also wasn't accounted for, but with SB, cooling typically won't help too much in getting a higher OC. It's mostly the silicon lottery.

Here's the chart:
A few things about understanding it:
n is the number of data points in the set. Larger is better.
The percentiles represent the percentage of chips that have a lower Vcore than you. So if you can do 4.8 GHz at 1.354 V, your chip is better (lower Vcore) than 90% of other chips at 4.8 GHz.
Data is collected from the Sandy Bridge Stable club, so all clock speeds were tested for 12+ hours in prime95, so they should reflect overclocks that are actually stable.

I welcome any questions or comments, especially anything I may have overlooked or did not consider.