Paying six times as much for a CPU doesn't make the entire computer 6x as expensive.
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I could make a 20X cost comp with little effort, the point is these unessesary costs add up, and most reasonable people would rather use that money for something more productive, like maturing assets instead of deprecating ones, such as the grand champion of depreciation, the computer. The differences between a $100 processor and a $1000 one are nothing to write home about and overclocked become miniscule.
Second, there has never been a time, and there never will be, when MHz are linearly related to price.
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Only because people leave logic at the door failing to do a cost/benefit analysis when computer shopping. See below. I would charge it too if people are willing to pay it.
Taking the argument to the extreme, if you can find a Duron-600 for $5.00 on the used market, there is no need for anything more because that gives the highest CPUMark/price ratio. And when you overclock that Duron-600 inside the dinged-up E-Machine case you rescued from the trash, oh mama! What savings!
It all depends on your priorities. If you spend five or eight or ten hours per day in front of your computer, how much is your time, and the pleasurableness of that time, worth?
A more useful increment is to talk about "best buys" at a certain price level. I think that most people on this forum would say that for $150-200 for CPU+mobo, a Barton (prob. mobile) and an NForce2 is the best bargain. At $300, most, though not all, would point to the socket-754 A64.
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The benefits and validity of value purchasing are well established and not really open to debate. The strategy? Simply identify your minimum requirements, then evaluate all suitable products, settling on the one with the highest price/performance ratio. It's only when you allow yourself to be clouded by emotion from feelings being refined, special, or a member of a select club do we allow ourselves to deviate from this model and buy products with a poor price to performance ratio. If that 600 Duron satisfies your minimum requirements, you're correct in recommending this outstanding value. But since 95% of the users here need a more powerful machine it's not even a factor in thier equation. Stay focued on th processors I was talking about in this thread and you'll begin to see the value for everyone because they are all top performers or can be made into top performers but at very different price points. Some have more VALUE than others.