It's hard to see how this can succeed
1. I'm sure that technical documentation was available, both from AMD and review sites
2. Marketing bumf (not direct from Intel) often counts hyperthreaded "cores" as full cores
3. I'm sure that he had the opportunity to return the part as not matching what was offered, but declined to do so
4. As the article points out, what constitutes a core isn't well defined (and perhaps main ALU and supporting stuff does count)
5. Probably hard to prove AMD intended to mislead (though perhaps plaintiff doesn't have to go that far)
6. Balancing actual loss versus what he's claiming, did the loss of half an FPU core per "real" core really affect him that much (who saturates their FPU units in desktop/laptop PCs anyway?)
It's not nice when you buy something that doesn't live up to expectations, but seriously, I think this guy doth protest too much.