What does TDP really mean? TDP @ OC?

[fRiend0]

Hello everyone,

I'm currently working on custom cooling. I was wondering, what does TDP actually mean? Many sources state different things... most commonly I see it as "heat power the processor dissipates at base clock speeds" but other sources state it as "electric power consumption" ... I need to find out the actual heat output as I'm designing the cooling system myself. Problem is that since it's not really a standard for all manufacturers, TDP can mean anything.

 

Does anybody know a GUARANTEED RELIABLE source where I can find the heat output of processors?

Also, I would like to ask, if anybody knows about a source where I could see TDP (heat power output) curve when you're overclocking processors. As I don't have the finances to test it myself it can be the only source of my information. If the curve itself is a problem, maybe just some values on classic OC settings on processors.

[Garett1]

Thermal Design Power. Its the maximum amount of heat  generated by the CPU or GPU.

The heat output of processors should be in the Specs of the processor to find a compatible motherboard of such.

 

https://en.wikipedia.org/wiki/Thermal_design_power

[bgibbz]

Thermal design power. 

 

 

Google it?

[Sintezza]

Thermal design power aka TDP is a value measured in Watts of which your cooling solution should be capable to dissipate from the die.

Or in simple laymen´s words, heat output.

Its not the actual max powerdraw (TPD) of the chip.

Allot of people seem to make the confussion still.

Allthough they are of course related to eachother.

Because allot of the electrical energy gets converted into heat.

[fRiend0]

People who can use google and wikipedia but can't read further than first two lines:

"However, the TDP is a conventional figure while its measurement methodology has been the subject of controversy. In particular, until around 2006 AMD used to report the maximum power draw of its processors as TDP, but Intel changed this practice with the introduction of its Conroe family of processors.^[4]

A similar but more recent controversy has involved the power TDP measurements of some Ivy Bridge Y-series processors, with which Intel has introduced a new metric called scenario design power (SDP)."

 

AGAIN MANY SOURCES STATE TDP AS POWER REQUIREMENT AND MANY AS HEAT POWER OUTPUT... EVEN MANUFACTURERS STILL MAKE THIS "MISTAKE"

[fRiend0]

ALSO, each manufacturer has a different measuring approach and TDP on AMD processors doesn't have to be comparable value to TDP on INTEL processors as even the measuring techniques are different. TDP is not a STANDARD from a scientific point of view

[fRiend0]

1 minute ago, L.Lawliet said:

Look..if u are trying to help can u just be less of an a holes when doing it?

 

 

I'm not trying to be an ahole, but I specifically said 

 

26 minutes ago, fRiend0 said:

Many sources state different things... most commonly I see it as "heat power the processor dissipates at base clock speeds" but other sources state it as "electric power consumption"

and people who replied didn't bother to read what they've shared in their answers...either google it or copypasta from wiki... which in 2 lines under states exactly what I said: TDP doesn't always state the heat output but many times the power requirement...

 

I'm trying to get a reliable information, not questionable. If there is even 1% doubt that it may not state the heat output of the processor the information is useless.

 

That's why I'm asking for RELIABLE source of information.

 

Thank you for your understanding.

[Sintezza]

45 minutes ago, fRiend0 said:

People who can use google and wikipedia but can't read further than first two lines:

"However, the TDP is a conventional figure while its measurement methodology has been the subject of controversy. In particular, until around 2006 AMD used to report the maximum power draw of its processors as TDP, but Intel changed this practice with the introduction of its Conroe family of processors.^[4]

A similar but more recent controversy has involved the power TDP measurements of some Ivy Bridge Y-series processors, with which Intel has introduced a new metric called scenario design power (SDP)."

 

AGAIN MANY SOURCES STATE TDP AS POWER REQUIREMENT AND MANY AS HEAT POWER OUTPUT... EVEN MANUFACTURERS STILL MAKE THIS "MISTAKE"

Well thats an interesting statement on that wiki page then.

Because total powerdraw is not only to be determind by the cpu.

But there also other variables like vrm efficiency.

I can tell you that an overclocked 6950X will draws significantly more power then the 140W max TDP that intels is giving it.

To me TDP is still thermal design power.

But Like i said those two are related, cause allot of the electrical energy gets converted into heat.

But its true that manufacturers confuse the terms more often then not.

With video cards for example the TDP numbers indeed indicate its max "expected" powerdraw.

[Stefan1024]

The CPU turns basicly all energy it consumes into heat. So if you know the power consumption you know the heat output. There are good reviews also looking at power consumption.

 

At stock the max. is <1.5 • TDP, with OC it can go up to 4 • TDP.

[Sintezza]

9 minutes ago, Stefan1024 said:

The CPU turns basicly all energy it consumes into heat. So if you know the power consumption you know the heat output. There are good reviews also looking at power consumption.

 

At stock the max. is <1.5 • TDP, with OC it can go up to 4 • TDP.

Yes thats why i said they are basicly related.

Because with cpu´s allot of the energy gets converted into heat.

But that doesnt mean that the actual TDP is also the max power draw.

Because that determines on some other variables, like which core clocks and actual load etc etc.

[fRiend0]

13 minutes ago, Sintezza said:

Yes thats why i said they are basicly related.

Because with cpu´s allot of the energy gets converted into heat.

But that doesnt mean that the actual TDP is also the max power draw.

Because that determines on some other variables, like which core clocks and actual load etc etc.

I know that there is a relation, but for my project I need precise values... and there can be as mentioned big difference between power draw and heat power output.

[Sintezza]

7 minutes ago, fRiend0 said:

I know that there is a relation, but for my project I need precise values... and there can be as mentioned big difference between power draw and heat power output.

Ah okay thats what you mean.

I think that @Stefan1024 gave a pretty accurate scenario above about what to expect.

 

I´m not sure but i think that there was some documentation online about how intel does their TDP measurements if im right.

I think that i have seen it somewhere, how they do their test methanology

[Stefan1024]

4 hours ago, fRiend0 said:

I know that there is a relation, but for my project I need precise values... and there can be as mentioned big difference between power draw and heat power output.

The heat output always equals to power draw. But the power draw does not equal to the wattage of the PSU you need.

 

The bigger difference is where the power is consumed. You only have to cool the CPU, but the RAM and other stuff also needs considerable amount of power.