As I posted in other thread, GPU cafe got this data from hardware.fr, and it's one of the most reputed French tech sites, but it may not be very famous outside France. They did a similar research to check hard drive failure rates, you can check it here
, being Samsung the worst with a 2.8% and Western Digital the best with 1.2%. I consider those guys a reliable source.
Faulty GPUs cost nVidia $43.6 million
, I think most of them are from the infamous notebook GPUs.
Certain notebook configurations of these MCP and GPU products are failing in the field at higher than normal rates. While we have not been able to determine a root cause for these failures, testing suggests a weak material set of die/package combination, system thermal management designs, and customer use patterns are contributing factors.