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Calculate TDP?

Bleek

Bleek

Bleek

Soldato
Joined
7 May 2004
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Does anyone know the equasion to calculate TDP?

I'm looking at running a AMD Brisbane at ~1.5GHz sub 1volt and wondered if I could get it near or under 20W TDP and therefore passive cooled. :D

This would be for a little, silent and neat media PC.
 
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Interesting, the calculator would suggest I can run a dual core Brisbane at 1.5GHz 1v and produce circa 20W TDP.

I wonder if that's low enough for passive cooling (with case fans of course), perhaps I need to get closer to 10W for that.
 
Well this would be a custom case, VERY small and 100% silent, sealed surround, no venting with a clear air flow through the design. Think set-top box, stick it anywhere and hidden from view. :)

TBF Hesky 2GHz is far too much for my requirements and the Opty was never the coolest of chips, nice to see you got it stable at .9v... gives me hope for even lower at lower clocks. :D
 
Well I'm an IT Project Manager, a specialist in Data Centre and Infrastructure, so I understand air flow, heat outputs, climates, enclosures of all scales etc. :)

My case design is quite radical in that there is very limited space, most of which is filled with a contoured foam/poly-composite, the case will be the heatsink for all components and will use a suspended wall cooling technology. Quite advanced stuff and not so simple to get right, but if it works it'll be ultra efficient and literally completely silent. :D
 
Hesky82 said:
Well the old San Diego's were 90nm and the Brisbane's are 65nm, makes sense for the new chips to run cooler.

Can you still get those Brisbane EE cpu's? they went as high as 2.2GHz with only a TDP of 35W!
Click to expand...

Yeah I was looking at those, the 1.9GHz is under 30W at stock volts. I'm pretty confident those chips will run 0.75-0.8v at near stock speed which is very cool (literally) for a dual core. Even less if I can regulate the voltage lower. After some careful consideration 10W TDP is my aim. However I need to calculate other heat producing elements and create a model that simulates the outputs and efficiencies of my design. :)
 
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