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To: Joe NYC who wrote (127814)	2/19/2001 8:23:07 PM
From: Mani1	Read Replies (1) \| Respond to of 186894

Joe re <<does the "total temp rise is 6 degrees" mean that the difference in temperature of 217 mm^2 die and the heat spreader (Tcase) can by up to 6 degrees?>> 6 degree was based on the assumption that power density is 50 W/cm^2 which is the case for Athlon. P4 has power density of only 25 W/cm^2 (no?), so temperature rise is only 3 degrees. When calculating these temp rises one must always know that power density is relevant, and not the absolute power. Re <<does it imply maximum die temperature of up to 78 deg C? (I don't know how localized hot spots on the die enter into this picture).>> Yes 75 (72+1+3) in case of the P4. As far as localized temp is concerned, I don't really know. But power should be extremely localized to have any effect since silicon is a great conductor. Mani