[philjohn]

Or, because they're not flush with cash, they go for a simpler to verify design.

Remember, a lot of the Zen arch was developed by Jim Keller, who is the brains behind the Athlon 64.

[matwood]

I loved my Athlon 64. IIRC, it ran hot as hell, but the price/performance was amazing.

[djsumdog]

I remember running two of the AthlonXPs on a Tyan SMP board back in the day. That was before we had multiple cores on a single processor.