Author: Robert Hyatt
Date: 17:49:38 02/13/00
Go up one level in this thread
On February 13, 2000 at 16:28:41, Tom Kerrigan 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 > >If it takes the temp down to -40, then how is this temperature never reached? > >>>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. > >Only a few days ago you didn't even realize that temperature affected switching >times. Now you are willing to bet about how much they are affected? I think this >is suspect. > >Do you know for a fact that they are increasing Vcc? Maybe they aren't. I'd like >to see a quote from AMD or Kryotech. > >-Tom GO to tom's hardware page. All the overclockers generally run up Vcc. It is a well-known trick. Otherwise you are just 'lucky' that the manufacturer was conservative in their specifications (ie if a 400 will run at 450 with no increase in vcc, then the chip was simply under-spec'ed.) AMD has _always_ been right on the ragged edge with their clock speeds, trying to keep up with Intel. All the overclocking stories I have seen over the past few years include instructions about raising the voltage. Sometimes from 2.1 to 2.2 for example, which sounds like a slight change, but maybe not... increase Vcc by 10%, the clock by 20%, heat may go up by 100%. Would be interesting to see what Kryotech does, but I doubt they release that detail to make it harder for the garage-overclockers to follow them. I didn't see any info on their web site, nor on toms hardware page that gave this kind of detail (it did give neat pictures showing the A/C compressor and cooling box for the cpu). But going from 750 to 1ghz doesn't seem reasonable without a voltage jump.
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