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Technology Stocks : Advanced Micro Devices - Moderated (AMD)
AMD 214.18-0.5%Dec 31 3:59 PM EST
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To: wanna_bmw who wrote (51741)8/20/2001 4:45:00 PM
From: Bill JacksonRead Replies (1) of 275872
 
wanna, You an engineer? What railroad?
Power is equal to the voltage times the current, that's it. We have a DC system here and the measured voltage and current are fine as they are what the thing eats.
Now if you put a scope on the power supply you would not see it do much other than DC, these spikes and stuff occur on the CPU. Probe assorted paths on the chip and you will see loads of current spikes of short duration, both high as well as low. The net result is that average current and voltage your meter measures.
I suppose you could immerse it in a calorimeter and run it for a while and measure the steady state temperature difference of the water or other coolant you use to stop it from burning.

Now as the chip manages the power it will use less. There will also be some variation in the power used by different chips from other batches/wafers/areas on the wafer at the same clock speed.

Bill
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