Author: Robert Hyatt
Date: 09:58:10 02/19/03
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On February 19, 2003 at 11:31:49, Wayne Lowrance wrote: >On February 19, 2003 at 00:19:41, Robert Hyatt wrote: > >>On February 19, 2003 at 00:11:08, Aaron Gordon wrote: >> >>>I just downloaded Crafty 16.19 and ran a bench for you guys. No single cpu Intel >>>box could ever touch this without sub-zero cooling. Just plain not going to >>>happen. >>> >>>Crafty v16.19 >>> >>>White(1): bench >>>Running benchmark. . . >>>...... >>>Total nodes: 67136136 >>>Raw nodes per second: 1766740 >>>Total elapsed time: 38 >>>SMP time-to-ply measurement: 16.842105 >> >> >>This is not a great test since that is a very old version. I'm not sure how >>1.7M compares to version 19.3 in nps... >> >>However, while on the question, what is an XP 2.44ghz machine, since I am not >>an AMD expert. Overclocked? If so, I consider that a worthless number, because >>of obvious reasons... > >Just wondering Bob, why do you feel that way ? stability ?, ask to find out if >his overclocking is rock solid. I would be interested too. If not then I agree >it is worthless. Yes, stability. The problem is that something can _appear_ to be rock solid, but not be. For example, suppose an integer add is done wrong, once every one billion times? My hash collision experiment suggests that this might not be noticable at all, yet the machine is _still_ producing wrong answers from time to time. And logic says that this will eventually "come home to roost". Think about AMD. They are competing with Intel. Why would they sell a processor to run at XXXX mhz, when it is capable of running at XXXX+N mhz? The answer is that they would not. They would rather run faster and increase their performance edge over their competitor. But the engineers have found that XXXX works in 100% of the cases, where anything greater slowly increases the chance for errors. Overclocking is like juggling hand grenades with loose pins. Eventually something bad is going to happen, although it might take a long time. When you overclock, you reduce the ability of the processor to operate correctly if there is any variance in the supply voltage, any variance in the temperature, any variance in the outside EMF interference, etc.
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