Newer is almost always better. Not only will my Barton 2500+ run at speeds way in excess of the 3200+ stock speeds, the extra cache IS a lot faster in many apps. Gotta use an nForce2 Ultra 400 based board. My 2500+ smokes P4 systems costing 2 to 4 times the price, and this is no idle boast!
I don't know why people think older AMD chips overclock better than the new ones. It's totally false, and right up there with other equally ignorant ideas like "Pentiums run cooler than Athlons", "Pentiums are more reliable" and the ever popular "P4's are faster than Athlons". All of these are BS and I have the benchmarks and temp readings to prove it.
Consider this: A 2-stroke leaf-blower motor runs at twice the frequency (RPM's) of a 4-stroke 2000 Horsepower blown fuel dragster motor. Use both to power identical dragsters and see which one actually runs the faster 1/4 mile (the only reason to own a dragster).
That's right folks, INTERNAL CPU CLOCKS DOES NOT EQUAL COMPUTER SPEED, regardless of what the salesman at Best Buy or Circuit City may have told you!
I build systems for a living. When people ask me to build P4 systems, I ask them "Why do you prefer a slower more expensive computer to a faster and less expensive one?", and shortly after that I give them the answer to the question they have asked. It is a resounding "NO!" The reason is that I can't justify building a P4 based system is because, while they sometimes compete with the Athlon's in application performance, they never do it effectively with respect to cost.
Yes, in my opinion everybody who has purchased a P4 based system has been fed a bunch of crap. I will not participate in the Pentium 4 hoax!