Author: Robert Hyatt
Date: 20:18:28 02/13/00
Go up one level in this thread
On February 13, 2000 at 20:55:29, Dan Newman wrote: >On February 13, 2000 at 11:12:18, Robert Hyatt wrote: > >>On February 13, 2000 at 00:00:30, Lonnie Cook wrote: >> >>>On February 12, 2000 at 19:53:12, Robert Hyatt wrote: >>> >>>>On February 11, 2000 at 23:54:03, Tom Kerrigan wrote: >>>> >>>>>On February 11, 2000 at 23:42:08, Robert Hyatt wrote: >>>>> >>>>>>I am definitely talking about 0c. You take the cpu to that temp, it won't last >>>>>>long as you get ice crystals, which play hell with gigahertz frequencies. That >>>>>>was why the cray was never taken below freezing until the immersion versions and >>>>>>they were not much below 0. >>>>> >>>>>Evidently Kryotech has come up with a solution to this problem, because they are >>>>>cooling the Athlon to -40C and running at 1GHz and AMD supports this. >>>>> >>>>>-Tom >>>> >>>> >>>>I don't believe they are doing this. They are applying -40c to the cpu, but >>>>the heat it is producing prevents the cpu from getting to -40 during operation, >>>>I'd bet. I'd bet the real cpu temp is well over 0c, if it has a temp >>>>thermocouple as my xeons. do. My xeons run at about 106F under heavy load, >>>>for a reference. >>> >>>Bob, >>>How can the real temperature of the CPU be well over 0° when mine is CONTANTLY >> >>>being cooled to 45°. heat is also drwn out through the back through the bottom >>>fan of the tower/refrig area? >> >> >>That is an easy one. In the cpu, all the heat comes from resistance that turns >>electricity directly into heat. The superG is simply pulling this heat out a >>lot faster than air cooling would do. This lets them ramp up the Vcc applied to >>the chip, which lets them increase the clock frequency, since higher voltage >>overcomes resistance/capacitance/inductance better. And all they are doing is >>providing a pathway for the heat to leave the core of the cpu chip quickly so >>that the processor doesn't "melt" which is what happens to many over-clockers. >> >>I have a pentium pro cpu chip I kept as an illustrator of just how hot these >>chips can get. It has a permanent finger-print on the top, where a friend of >>mine said "hey how hot does this get?" right before he touched it. It removed >>a layer of skin. > >That happened to me once with Schottky TTL multiplier chip--I'd read it >shouldn't exceed 78 C, and, being more familiar with the Fahrenheit scale, >I put my finger on it to make sure it wasn't too hot... > >-Dan. I had no idea a P6/200, overclocked to 233 (no, it wasn't _my_ machine) would run so hot. The guy that touched the thing almost had his eyes pop out. This was the machine I sent to Jakarta (I un-overclocked it back to 200 as it was really unreliable at 233, and the chip had _no_ heat sink. I removed the plain chip and replaced it with a retail version of a P6/200 with the heatsink/fan installed. I couldn't stand the idea of a bare chip, that hot...
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