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To: Cirruslvr who wrote (3200)	8/1/2000 11:21:55 PM
From: Mani1	Read Replies (2) \| Respond to of 275872

Cirruslvr re <<I remember you folks saying something about its T junction temperature of being a pitifully low 60 deg C, and how that is pretty bad. What does that measure again? Something like max temperature the case can be for the processor to run?>> It is the maximum junction temperature. Effectively it is the maximum temperature the die itself needs to be, in order to be in spec. <<The data sheet says that with the new stepping, the 1GHz's Tj is 70 deg C, vs 60 deg C previously, vs 80 deg C for 866MHz and slower processors. The 933's is 75 deg C, and the 1.13GHz's is barely better than the first 1GHz - 62 deg C. >> In the case of the first PIII, which the max was at 60, there is only 35 degrees worth of delta temp. 60-ambient) to work with. That is a very tight window for a PC. That means the total temperature fall from the die to the ambient can be the max of 35 degrees, that includes the sum of all the temperature rises across the die, heat spreader, heat sink base, fins, air around the fins, case air and to the ambient. To thermal engineer, "allowable delta T" is everything. In the case of the newer PIII 1 GHz (maximum of 70) it is a lot better. The latest which requires 62 is probably about as hard to cool as the original 1 GHz since it probably generates more heat in place of having 2 more degrees room to wigle. Re <<With this data, how much faster do y'all think Intel can push the PIII on the current process? >> I was extremely surprised that Intel actually went as little as 60 degrees in the first release. IMO a very clear sign of desperation, they would have never done it otherwise. Will they go below that to release even higher speeds, I doubt it very much. I think Intel has said that 1.13 GHz is the end of the road for the 0.18 process, and the next speed comes at the 0.13. Mani