12:04 PM - 11/06/2000 by
Frank Völkel
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We compared three different AMD CPUs of the same clock speed. The three processors' underlying model is AMD K6-2/500, which has no on-die L2 cache. The K6-2 communicates via a 100 MHz processor bus with its external L2 cache. Therefore, most motherboards are equipped with 512 kB or 1 MB cache modules that sit close to the socket. Some rare motherboards such as the FIC PA-2013 or DFI P5BV3+ even utilize 2 MB of cache.
| Processor | AMD K6-III+ | AMD K6-2+ | AMD K6-2 |
|---|---|---|---|
| Process technology | 0,18µm | 0,18µm | 0,25µm |
| CPU clock | 400 to 500 MHz | 475 to 550 MHz | 300 to 500 MHz |
| CPU platform | Socket7 | Socket7 | Socket7 |
| CPU system clock | 100 MHz | 95 to 100 MHz | 66 to 100 MHz |
| L1 cache | 64 kB | 64 kB | 64 kB |
| L1 cache access | CPU core clock | CPU core clock | CPU core clock |
| L2 cache interface | 64bit | 64bit | 64bit |
| L2 cache | 256 kB on-die | 128 kB on-die | on the motherboard, max. 2048 kB |
| L2 cache clock | CPU core clock | CPU core clock | 66 to 100 MHz |
| L3 Cache | on the Motherboard, max. 2048 kB | on the motherboard, max. 2048 kB | no |
| MMX instruction set | yes | yes | yes |
| 3D instruction set | 3DNow | 3DNow | 3DNow |
| Multiprocessor support | no | no | no |
| Power saving modes | PowerNow | PowerNow | no |
| Core voltage | 1.4 to 2.0V | 1.4 to 2.0V | 2.2 to 2.8V |
| I/O voltage | 3.1 to 3.3V | 3.1 to 3.3V | 3.1 to 3.5Volt |
| Power dissipitation | max. 23W | max. 20W | max. 29W |
There's a fundamental difference between new K6-2+ and K6-III+ CPUs and older K6-2 models. For using up-to-date PowerNow technology, you need a special motherboard with voltage regulator.
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