Author: Dan Newman
Date: 17:55:29 02/13/00
Go up one level in this thread
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.
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