Author: Tom Kerrigan
Date: 20:30:15 02/13/00
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On February 13, 2000 at 23:10:26, Robert Hyatt wrote: >On February 13, 2000 at 21:32:05, Tom Kerrigan wrote: > >>On February 13, 2000 at 20:40:03, Robert Hyatt wrote: >> >>>Do the math again. If you run at 1ghz (1ns) and drop the temp 40 degrees, >>>and pick up 10 picoseconds, that doesn't make much of a difference. If you >> >>For some reason you seem to think that there's only one gate switch per clock >>cycle... >> >>-Tom > > >No I don't. I factored in up to 100 gates/clock, just for an upper limit >and got 10%. 10% doesn't come anywhere near 33% that Kryotech is getting >with the Athlon... Well, we know that the Athlon runs at 850MHz without special cooling. So if you figure a clock = 850MHz = 1.176 ns = 100 gates, then 1 gate takes 11.76 ps. To get to 1GHz, then 1 gate has to take 10 ps. So you're saying that a huge drop in temperature could not possibly lower the switching time from 11.76 ps to 10 ps? Of course, this totally ignores the fact that AMD may be giving Kryotech specially sorted chips that have no problems running > 850MHz. If I have time tonight, I might try to work out some of the math to see how much of an effect temperature can have. -Tom
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