The classic Athlons cache ran at a fraction of the speed of the core. The Durons cache is on die, thus it runs at full core speed. Duron is better and also cheaper.
You can get all the scoop on the AMD website. AMD has all the technical details you could ever want posted along with configuration guides and recommended components.
Actually Connie I would have to disagree. The Classic athlon is still a little bit superior to the duron on almost all apps. The 512k l2 cache running at 1/2 to 1/3 cpu clock is still better than 64k at full clock. This will depend on how heavy the program hits the ram. Once Durons 64k of l2 cache is depleted it has to go to system memory running at 133 mhz. This happens alot less frequently with the classic athlon (remember it has 512k). so where a calculation may be performed by the classic in the cpu's cache the duron might need to resort to system ram thus giving a slow down in performance.
The difference between the duron and the t-bird is the size of the l2 cache duron has 64k while t-bird has 256k. This adds quite a bit of performance on cpu intensive apps.
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