Author: Tom Kerrigan
Date: 22:02:36 02/10/00
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On February 10, 2000 at 23:27:52, Robert Hyatt wrote: >The physics don't support you there. IE gates don't function faster at >absolute zero, but the resistance goes to zero. I know of no physics law >that says electrical signals propagate faster at lower temperatures... I'll try to avoid saying something rude here. I'm sure you know that gates are not wires that simply propogate electrical signals. So while lowering the temperature will not cause the electricity itself to flow faster, it WILL change the amount of time it takes to induce a channel in the substrate between source/drain. >Of course, you can ramp up the voltage to make them switch faster, and you >can make them smaller, because cooler temperatures combat the heat rise for >smaller junctions. But I sure don't see why they would switch faster. If >they did, Cray would have run his stuff at really cold temperatures since he >was speed-centric... I remember reading that several Crays required massive amounts of liquid nitrogen to flow over the processors during operation. -Tom
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