Exponential growth of subthreshold leakage

Article: What Do Overclockers and Supercomputers Have in Common?
By: Doug S (foo.delete@this.bar.bar), January 7, 2013 10:25 am
Room: Moderated Discussions
Iain McClatchie (iain.delete@this.mcclatchie.com) on January 7, 2013 12:28 am wrote:
> David,
>
> It turns out the Vt goes down at higher temperatures (Wikipedia has some coverage). That
> means the processor can run a little faster as it gets hotter. It also means that subthreshold
> leakage increases at higher temperatures, which can lead to thermal runaway.
>
> This effect used to be dominated by the higher wire resistance at higher temperature that you cover
> in your article. Supply voltages have been coming down, and threshold voltages have not been changing
> much (at least for the leak-stop transistors). As a result, the temperature effect on voltage threshold
> has been steadily getting more important and it now dominates wire resistance in the latest commodity
> processes. The high-voltage, HIGH-temperature corner is now the fastest corner!


Does this mean that overclockers shouldn't try to supercool their CPUs anymore with stuff like liquid nitrogen, and instead do only the amount of cooling required to keep the die temp below Tmax?
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      Exponential growth of subthreshold leakageDavid Kanter2011/12/15 04:20 PM
        Exponential growth of subthreshold leakageIain McClatchie2013/01/07 12:28 AM
          Exponential growth of subthreshold leakageDoug S2013/01/07 10:25 AM
          Exponential growth of subthreshold leakagesomeone2013/01/07 11:12 PM
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