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: Petz who wrote (27055)	1/31/2001 9:04:28 PM
From: fyodor_	Respond to of 275872

Petz: At zero frequency, it appears there would still be power dissipation of about 8 watts, though the number could be anywhere between 3 and 10 watts. That makes sense, because the TBird draws 5 watts in "STOP GRANT" mode, which is, basically, zero Hz for most of the CPU. You can actually see where the remaining current goes if you check my post to Jim earlier today (regarding mobile PIII current draw @700MHz): Message 15278271 ;) EDIT: I tried finding the same information for the Athlon in AMD's docs, but couldn't... :( -fyo

To: Petz who wrote (27055)	1/31/2001 9:51:46 PM
From: porn_start878	Respond to of 275872

Since at this point I forgot what we were trying to estimate, I'll leave it to someone else to calculate the estimated power consumption. ROTFLMAO Gosh! I was skipping the heavy maths hoping for a number somewhere.. Max

To: Petz who wrote (27055)	2/1/2001 10:53:03 AM
From: andreas_wonisch	Read Replies (1) \| Respond to of 275872

Petz, thanks for the clarification and the more accurate formula -- good work. If we apply it to our example (700 MHz at 1.16V) we get: If we assume it is 0.2 volts, the predicted TBird power as a function of frequency (F, in MHz) and voltage (Vcc) would be P(max)= (VccVcc/3.0625) 4.3 watts + (Vcc/1.75) * [ (Vcc-0.2)/1.55 ] * 0.0509 * F P(max) = 1,89W + 14,62 W = 16,51 W This is 0,4W below my previous estimate, so it wasn't that bad. And if someone has too much time, he could calculate the mobile Duron power consumptions as well. ;) Andreas