I think the case of HT is more pure "segmentation", and a little different. I bet most of the parts that ship with HT disabled have all threads working. The nu

I think the case of HT is more pure "segmentation", and a little different. I bet most of the parts that ship with HT disabled have all threads working. The number of transistors involved in HT are quite small. There are probably very few cores where one thread works and the other doesn't, compared to the number of CPUs that work or don't work because their cache or something more fundamental is screwed up by a defect. I wouldn't be surprised if they don't even test for one thread working and the other not, and the "defeaturing" is a separate step after yield binning.