Author: Albert Silver
Date: 10:55:06 02/13/00
Go up one level in this thread
On February 13, 2000 at 12:57:14, Andrew Carey wrote:
>On February 13, 2000 at 11:05:08, Robert Hyatt wrote:
>
>>On February 13, 2000 at 03:15:12, Tom Kerrigan wrote:
>>
>>>On February 12, 2000 at 19:53:12, Robert Hyatt wrote:
>>>
>>>>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.
>>>
>>>Possibly. I wouldn't know. If they aren't getting the CPU down to -40, then I
>>>don't see why they would be taking such precautions against condensation.
>>>(Somebody else posted about this yesterday.)
>>
>>
>>
>>quite simply. The "cold box" attached to the cpu is removing heat by spraying
>>freon into a small chamber where it evaporates and takes the temp down to about
>>-40c. The cpu is providing enough heat that this temperature is never reached,
>>which is the point of the device. If you shut the cpu off, you have a block of
>>aluminum that _is_ suddenly at -40, so that you get first ice, then water. They
>>turn on a heater device to replace the CPU's heat output, and get everything
>>above the condensation point, before the thing gets shut off. Their cooling is
>>not anything remarkable at all. The main problem they had to solve is that a
>>cpu that is idle (halted in an O/S wait loop) produces almost zero heat, so they
>>have to avoid turning the CPU and associated motherboard area into an icecicle.
>>
>
>icicle
This comment warms my heart. Bruce would be prowd. :-)))
Albert Silver
>
>
>
>>>
>>>Regardless of the actual temperature, it's obviously going to be much cooler
>>>than a normal computer. And that makes switching times go down. And that's what
>>>matters.
>>
>>I'd bet that the difference is in picoseconds, not nanoseconds, which doesn't
>>help a whole lot. What matters is that they can up Vcc without burning the
>>thing up.
>>
>>
>>
>>
>>>
>>>-Tom
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