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Celeron 2 and Pentium 4 Power dissipations

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Toast

Member
Joined
Sep 25, 2001
Here are some graphs that illustrate modeled power dissipations for the Pentium 4 Northwoods, and Celeron 2 Tualatins. All of the pertinent data was gathered from the Intel s-spec pages and voltage models I prepared in recent weeks.

Toast
 

DSTA

Member
Joined
Nov 29, 2001
Location
NRW, Germany
Interesting!

Can you explain how you calculated that?

The different dissipations for different CPUs at the same clock speed are due to higher FSB on the lower multiplier CPUs? What VCore do you use for the yet unreleased frequencies?

Sorry for the questions -- but you did ask for comments :).
 
OP
T

Toast

Member
Joined
Sep 25, 2001
DSTA,

Thanks for the interest. After some basic research, I understand that power dissipation follows the following model:

P = C*(V*V)*F

where:
P is power
V is voltage
F is core frequency
C is a thermal factor

P, V, and F may be obtained from the Intel product specification sheets, allowing C to be calculated for each cpu offering.

Now, in order to predict the power dissipation for overclocked chips, I had to model required core voltages to operate at a target core frequency. The data to do this is readily available in our overclockers database. I have posted these models for the Pentium 4 Northwoods, and also the Celeron 2 Tualatins.

Having V=function(F), and assuming C is independent of V, F, and T, I can produce a power dissipation curve for each cpu offering across a range of frequencies. A simple yet enjoyable excercise.

Toast
 

Barryng

Member
Joined
Nov 16, 2001
Toast, great data! Thank you!

This certainly opened my eyes. I really had underestimated how much energy my 1.8 Gig Northwood at 2.4 Gig was dissapating.

Could you be more specific about the reference to what voltages you assumed at various speeds?

Thanks again for your efforts.
 
OP
T

Toast

Member
Joined
Sep 25, 2001
voltage graphs

RhoXS,

Thanks for the comments.
Per your request, I have attached the referenced graphs from which I did the regression analysis to produce the voltage models for the Celeron 2 and Pentium 4 processors.

Toast