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The AMD Duron Processor
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The AMD Duron was released in the summer of 2000 as a low-cost alternative to the Athlon processor and the Pentium III and Celeron processor lines from Intel.
The Duron is pin-compatible with the Athlon and operating on the same motherboards. It has the same 128K of level 1 cache as the Athlon, but only 64K of level 2 cache, as compared to 256K on the more expensive chip. Because of this, the Duron generally lags behind the Athlon on business applications, but keeps up in floating-point operations thanks to its powerful FPU, which is identical to the Athlon's. The original Duron was limited to operating on a 100 MHz front-side bus speed, while the Athlon at the time could run on a bus clock of 133 MHz. Later Athlons supported a 200MHz bus.
References: AMD Duron Tech Docs
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