Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: TGPTNDR who wrote (133644)	9/23/2004 8:37:28 PM
From: dougSF30	Read Replies (1) \| Respond to of 275872

Actually, since then, Paul@iHub made his brilliant observation, and I think we can't assume there is any problem. In fact, I think the evidence suggests 90nm is disspating less power than 130nm, at least at the 3500+ bin. It's not quite clear where they placed the temperature sensor, but the range of temps under load suggests "die-like" temperatures, not "avg. heatsink" temperatures. The photo lends some support to this notion-- the sensor cable is the one with two black wires. The point is that one would expect the die temperature of an 84mm^2 part dissipating the same power as a 144mm^2 part to be considerably higher. Therefore, the fact that the 90nm "die-like" temperature is only up a little bit, and that is with the 90nm part being overvolted by 5%, suggests that the 90nm part is dissipating LESS power than the 130nm Newcastle. Doug

To: TGPTNDR who wrote (133644)	9/23/2004 10:47:05 PM
From: Joe NYC	Respond to of 275872

TGP, So, at this point I think we can assume the problem is excessive leakage in the cache? I am not quite sure what we can assume mainly because of the overvoltage problem. Second isue (the one Paul Flynn mentioned) is that when dissipating the same amount of heat from smaller die will cause higher die temperature, I just have no idea how much higher. The heat conductivity from die to heat spreader should be good, but I have no idea about what actual numbers are. Theoretically, you may have the same overall heat dissipation in 2 dies, but the smaller one will run a little hotter, if everything else remains the same. Joe