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AMD K6-III
The K6-III, code-named "Sharptooth", was an x86 microprocessor manufactured by AMD, released on 22 February 1999, with 400 and 450 MHz models. It was the last Socket 7 desktop processor. For an extremely short time after its release, the fastest available desktop processor from Intel was the Pentium II 450 MHz. However, the K6-III also competed against the Pentium III "Katmai" line, released just days later on February 26. "Katmai" CPUs reached speeds of 500 MHz, slightly faster than the K6-III 450 MHz. K6-III performance was significantly improved over the K6-2 due to the addition of an on-die L2 cache running at full clock speed. When equipped with a 1MB L3 cache (on the motherboard) the 400 and 450 MHz K6-IIIs is claimed by Ars Technica to often outperform〔(Intel vs AMD, 1999 )〕 the hugely higher-priced Pentium III "Katmai" 450- and 500-MHz models, respectively.
==Architecture==
In conception, the design is simple: it was a K6-2 with on-die L2 cache. In execution, however, the design was not simple; with 21.4 million transistors. The pipeline was short compared to that of the Pentium III and thus the design did not scale well past 500 MHz. Nevertheless, the K6-III 400 sold well, and the AMD K6-III 450 was clearly the fastest x86 chip on the market on introduction, comfortably outperforming AMD K6-2s and Intel Pentium IIs.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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