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Politics : Formerly About Advanced Micro Devices
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To: Mani1 who wrote (68446)8/11/1999 4:16:00 AM
From: kash johal  Read Replies (1) of 1579136
 
Mani,

Re:"I believe it is done experimentally but I am not sure. But anyone who knows the simple basic about thermal management knows that the maximum
wattage that an IC is to be designed for is not peak current multiplied by core voltage.

You apparently like Elmer and Paul know very little about this subject. "

Boy this power thing has everybody excited.

I'll attempt a simple explanation.

The current consumed by a chip is not continous and fixed. It varies from start up to depending upon what apps are being run. So it is an AC phenomena.

But heating of the chip is effectively worked out by figuring a DC equivalent.

So if the chip took 100 Amps for 10 sceonds and 10 Amps for 50 seconds and the cycle repeats.

The heat produced would be the equivalent of 15 AMPS say. For an AC current - folks use the RMS value to calculate the effective DC value.

Now that everyone is confused:

Paul is correct that the designers need to design for absolute current - ie the regulators etc. But the actual power consumed is different than this number.

So the real max. power is figured out by running the most CPU intensive cycle as fast as possible and looping it continously. Ie by measurement as Mani has suggested.

Anyhow the K7's power at 50Watts is not too terrible.

Enuff fud.

Regards,

Kash
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