AMD never directly claimed that their "Performance Rating" number was intended to compare an AMD cpu with a Pentium of any stripe. What they have maintained is that when they stopped including the cpu's clock speed in the names, they wanted buyers to be able to know how the newer cpu's compared to those that did include clock speeds in the names (being the "Athlons" that were last produced with "Thunderbird" cores).
Ordinary users have taken this with a grain of salt, and directly compared 3.0 GHz P4's to the A64 3000+ cpu. For ordinary, general, day to day BUSINESS type usage, the two named are closely comparable, with some things done in that environment ahead or behind on each side. The advantage that AMD offered there was a more competitive price.
However, when it comes to gaming activity, AMD cpu's have mostly worked BETTER than equivalent Pentiums back to the XP's era, when the Performance Ratings were first used. And for the high performance geeks, the AMD cpu's have seemed to offer a higher ceiling that might be worked toward as a percentage of performance increase possible when using Overclocking tweaks.
If you want to do some game playing with any fast-moving action game, using the latest video cards, the A64 is far less likely to offer a choke on speed than a P4 is. The FX's, comparable Opterons, and the fastest X2's are particularly adept for these games, but the gamer doesn't get the same kind of price advantage when looking at the top levels, where FX's cost as much, almost, as P4 EE's.
:thumbsup: