Re: I also just wonder...
The period was October 2002-December 2007 - the beginning of which was when the K8 x86-64 chips were released and outclassed much of what intel had to offer (Athlon 64 v Pentium 4 (32bit) ) .
I had a laptop with an AMD 64 3000 and it was much better than my work desktop and friends P4 machines at the time.
A certain company were offered free AMD chips but only took 160,000 as if they took any more they would have lost the intel "rebate" .