"A triple core is a defective quad, the silicon would have been spent anyway, they make money on what would otherwise be lost on trashed/recycled cpus."
And you of course would be wrong with this overly simplistic statement. Like AMD, no business sense as you need to look at total ROI, and not a "grunt, grunt...it would have been thrown away anyway" analysis.
First - the tri-core segment pushes down the upper end dual core prices which are sold IN FAR MORE VOLUME than tricores (at LEAST a 10:1 ratio, if not more) If you can make $5-10 more for 10X the volume...you do the math!
Second - your assumption baked in (that you don't realize) is that AMD would have lost the sale if there was no tri-core bin. This is obviously not the case as with no tri-core you would have a mix of people moving up to quad core or down to dual core, and of course some may move to Intel. So to dumb this down you may end up throwing away a chip that costs $60 (or whatever a quad core costs to make), but replace that sale with a higher margin part sale. This may blow your mind but it's possible the margin on a quad sale may actually be better when comparing it to throwing a tricore away (it will at least offset the "throwing a tricore away" cost impact)
Third - there are costs to FINISHING, SELLING, BINNING, STOCKING, MAINTAINING INVENTORY, LOGISTICS, etc of maintaining the extra bins for the tri-core. This is not huge, but not "free". So this view of it essentially being found money or effectively a free sale, is wrong.
FINALLY - the assumption nearly everyone makes is that a tri-core is just a quad core with a non-functional core. Is it possible, some of these are working quad core that couldn't meet the TDP bin? Is it possible that AMD is 'locking' good quad cores to meet tri-core demand? people are ASSUMING these are chips that 'would have been thrown out anway' but has anyone actually confirmed this is the case for ALL tri-cores? I have seen no official statement from AMD that these are only non-working quads - while some (or even most) of them may be, ever think they all might not be?
In short, people should look at a bigger picture of overall impact and not 'tricore or throw away' as if that sale occurs in a vacuum and has no other impact on AMD sales or other part prices.
Or perhaps folks' 3rd garde logic on this is correct....