According to the documents, Prescott taped out in late May and it had originally estimated the original power requirements lower than the reality.
But, the documents indicate, there are no changes to Prescott frequencies and Intel is still on track to introduce a 3.4 GHz Prescott in Q4 of this year. It did, however, have to revise its FMB guidance that ended up in revision 1.5, as this was the only way to make all Prescott enabled motherboards support the chip.
The voltage thermal regulator design (VR_TDC) recommendations were increased from 68A to 80A. The currently enabled PSC FMB1 heat sinks are sufficient when matched to Ta =38 oC chassis Intel claims. This document also shows that the Icc MAX is increased from 78A to 91A while the Power TDP is increased from 89W to 103W. The Max Tc is increased from 69C to 74C. This means that even pre-silicon Prescott was going to have 89W heat dissipation.
This means that there is not much room for clock increase in this Prescott generation. According to roadmaps we've seen 3.4 GHz will remain the highest clock for Q4 03 until at least end of Q1 04 since we suspect that Intel needs time to respin this chip and try to make this dissipation more reasonable. Lord save them from 150W.
103 W can be cooled down with regular air heatsink but you have to be aware that this cooler would be a very massive and noisy number indeed.
The 3.2 GHz P4 already has a massive and not so quiet Intel reference cooler. It just could be that AMD is not in as big trouble as we thought. µ
Intel's shift to 90 nanometers could be a little "shaky"
Intel Prescott chips not backward compatible with current motherboards
Intel Prescott broke my Babelfish
Intel confirms Prescott does dissipate 100W
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