Formerly About Advanced Micro Devices Message Board

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Politics : Formerly About Advanced Micro Devices

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To: Ali Chen who wrote (98024)	3/11/2000 5:42:00 PM
From: Mani1	Read Replies (3) of 1572373

Ali, Re <<with HUGE EXPENSIVE ALL-COPPER heat sink, is a clear evidence that something is still wrong with Intel's ability to handle standard junction temperatures>> Hi Ali! Finally someone who knows what he is talking about. Something is indeed very worng with "Intel's ability to handle standard junction temperatures". I didn't want to get into this since I did not want to get into a bickering session with Paul who has no idea what he is talking about. According to here---http://developer.intel.com/design/pentiumiii/datashts/24445206.pdf --- 1 GHz has max junction temp is 60 degrees C !!!! This is amazing! A nice fella pointed this out to me by emailing me this post aceshardware.com Very nice post and 100% accurate. The fact of the matter is that 1GHz Coppermine has a much more aggressive thermal design requirement than the 1 GHz Athlon, not to mention much more expensive. Again, the Coppermine needs the junction temp of only 60 degree C, to run properly. Intel must be very desperate to release this part. A typical number is in the 80's. Considering that inside the case is usually taken to be 35 C, this means the 1 GHz Coppermine needs to be cooled more than 2 times [(80-35)/(60-35)] more efficiently than the PIII 800!!!! 1 GHz Coppermine needs the total thermal resistance from the die to air in the case, of less than 0.8 W/C! That is very low. It is only doable with high speed fans and finely bonded (not extruded which is much cheaper) aluminum sink and a thick copper spreader. Mani

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