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Politics : Formerly About Advanced Micro Devices -- Ignore unavailable to you. Want to Upgrade?

To: Petz who wrote (68451)	8/11/1999 2:09:00 AM
From: Mani1	Respond to of 1578927

John Re <<Pitiable Paul, still does not understand that an instantaneous peak of 42 AMPS current draw at 1.6 volts does NOT equal 67.2 watts of RMS or thermal power dissipation.>> Paul is not only one who has problem with this. Mani

To: Petz who wrote (68451)	8/11/1999 2:22:00 AM
From: Charles Tutt	Read Replies (1) \| Respond to of 1578927

Nonetheless, don't you need traces and a power supply capable of providing 42 amps?

To: Petz who wrote (68451)	8/11/1999 3:23:00 AM
From: THE WATSONYOUTH	Respond to of 1578927

<Pitiable Paul, still does not understand that an instantaneous peak of 42 AMPS current draw at 1.6 volts does NOT equal 67.2 watts of RMS or thermal power dissipation.> You are right. From the AMD web site,they describe a peak instantaneous current of 42A. However, it in order to spec bulk capacitors which supply the current to the processor during sudden excessive demands that can't be supplied by the voltage regulator (like going from a sleep mode to normal mode) This clearly does not equate to 67W of thermal power dissipation. Interestingly, while there I noticed that the AMD Athlon Processor Thermal Solution Application Note 22439 is not now but will be, as they say, AVAILABLE SOON. So, maybe AMD still is not sure how to best cool this chip. THE WATSONYOUTH

To: Petz who wrote (68451)	8/11/1999 3:43:00 AM
From: Paul Engel	Read Replies (1) \| Respond to of 1578927

Petz - Re: "Paul, still does not understand that an instantaneous peak of 42 AMPS current draw at 1.6 volts does NOT equal 67.2 watts of RMS or thermal power dissipation." Now yoiu are acting stupid - as usual. The MAXIMIUM current speced byAMD is 42 AMPERES - and it is NOT designated as a PEAK current - but as a MAXIMIUM CURRENT for power supply calculations. Paul

To: Petz who wrote (68451)	8/11/1999 6:32:00 PM
From: Bill Jackson	Read Replies (1) \| Respond to of 1578927

Petz. Re; peak power etc. I ahd thought that a clocked device like a single gate draws the max current when it changes state as it is clocked. No state change=no current. Now when you get 22 million transistors do they all dance at to the same tune?, by that I mean do they all clock at the same time? so you get a huge current pulse at a 600 Mhz rate?, or are there so many things in different states, moving stuff around etc that this is all averaged out to an average current. A DC current of 42 Amps at 1.6 volts does indeed equal 67.2 watts. If you have a saw tooth with flat sides you end up with a RMS value of 50%(unlike the sinewave of .707) because the voltage is either there or not and the sides are so flat they are fleeting. Hell even sloped ramps are 50% so it does not matter. SInce each gate is a 50% RMS situation does that mean the RMS current is 21 Amps, leading to an RMS wattage of 33.6? Bill