the K6 2 is faster at rendering, games, video encoding, etc.
the K6 III may have slightly better Windows performance in general, but I used my K6 2 @ 500, I compared it to my K6 III+(which is identical to the K6 III except smaller) at all speeds. the K6 III had a little better memory bandwidth on benchmarks, even running 100mhz slower, but I'd take an extra 100mhz processor speed over that anyday.
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why, oh WHY, is the world run by morons?