Author: Andrew Carey
Date: 09:57:14 02/13/00
Go up one level in this thread
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 >> >>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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