Advanced Micro Devices - Moderated (AMD) Message Board

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Technology Stocks : Advanced Micro Devices - Moderated (AMD)

AMD 213.43

+6.2%

Dec 19 9:30 AM EST

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To: combjelly who wrote (27989)	2/10/2001 4:45:32 PM
From: fyodor_	Read Replies (2) of 275872

combjelly: An important point here. Currently both the Tbird and the Athlon can be over-clocked to about the same speed using liquid nitrogen. I'm assuming you mean both the TBird and the P4... If so: These LN2 overclocking comparisons are dangerous. The transistors can switch insanely fast at those temperatures and [some types of] noise issues are reduced significantly. This has a variety of implications that make comparisons almost completely invalid: - All heat issues are essentially nullified. Thus it doesn't matter if one core dissipates more heat than the other. With more conventional cooling, this is most certainly not the case, since transistors switch slower at higher temperatures. - With the transistors switching extremely fast, completely new limiting speed-paths can easily be brought to light. These may be very simple to solve or never arise, even with a finer process (i.e. a shrink). - Noise characteristics are changed. Needless to say, thermal noise is much lower at -196°C. Who knows what effect this might have? (I'm sure someone does, I just don't). I'm quite certain, however, that this effect is not accurately modeled by using a finer process. I'm sure there are plenty more, but suffice it to say that I don't really see what purpose is served by a comparison of the overclocking capabilities of the Athlon and the P4 at -196°C. (Not to mention the fact that the number of samples is way too small to be statistically significant.) -fyo

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