[GeronL]

I fail to see what they were doing wrong.

If a PC maker decides to make a contract to buy Intel chips exclusively for their machines for a discount, then thats business. Let the other company find their own PC seller.

[Use as Directed]

They used their 80% market share to keep their only other serious competitor out of the market. In 2003-2004, AMD had the superior solution for 1P, 2P and 4P servers. They blew Intel away nearly every benchmark and performance test. But they had far few design wins from PC manufacturers because it was very difficult just coming out of a recession to give up the huge financial incentives from Intel. (And Intel was so scared for losing even a portion of its market share that when you consider the incentives, they sold many chips at cost or even below cost)