Do we know if that quoted 5% failure rate over 3 years (based on laptop usage patterns) is per port or per board?
So far the only detail Intel has given is they expect 5-15% of chipsets to fail over a 3 year period. Normal failure rate should be 1-2% really, personally I see this as sketchy info and failure rate over a given time is generall averaged for all problems and 3 years is a standard period to mention for "normal" problems.
I really do get the impression this problem will hit every single person who uses sata 2 ports, the problem itself is described as the transistor involved simply failing due to voltage being applied. This voltage is applied 100% of the time its on, using the sata 2 ports or not. That means, realistically it will be rare for that transistor to not fail, the issue is that few people use more than 2 ports so most people just won't even be aware of a fault.
We've really got no info about how long the transistor takes to fail, the timeline Intel have mentioned is misleading, as is the expected failure rates due to the nature of usage.
I'd assume a LOT of people on OCUK and other enthusiast forums use more than 2 drives, but they make up a tiny tiny portion of sales, 99% of Sandy bridge sales will be through Dell/HP/Acer/etc, the vast majority of them have SSD's/extra hard drives as extra costs, and most users who buy a "dell" type box are also more likely to back up to a USB drive than adding second internal drives or paying for an expensive SSD.
You have to remember that probably the most crucial part of the announcement was keeping the share price as high as possible, so it has been worded to sound as low key a problem as possible.
Full recall/replacement program costing a billion dollars(I'd also bet my life on that being an underestimate), isn't something you do when it will only effect a very very small portion of people.
IE 5-15% of people who use the sata 2 ports, would be 1-2% of all users, 5-15% of all users really does scream out, all the chipsets will fail if use sata 2 ports.
Will be interesting if several people/review sites/tech sites keep sandybridge chipsets going to see how long they take to fail, infact, someone should definately do that.