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Rumor: GTX 480 TDP is actually 250w

H

Headfoot

Diamond Member
http://www.fudzilla.com/content/view/18170/34/

This seems to pit Bright Side of News's prediction of 275w vs Fudzilla predicting 250w TDP. In any case "TDP" does not necessarily mean power usage, rather it means maximum specified heat dissipation.
This would place the GTX 470 even lower, perhaps even getting close to 200w TDP?

Anyway I thought I would share
 
At one time there was supposed to be a 512 CUDA core card. I am assuming that would have had a TDP higher than 250 watts.
 
I thought it was 295watts? Then 280,275, now 250 because of 32 less shaders.

I can't wait for the real results ,this is ridiculous.
 
happy medium said:
I thought it was 295watts? Then 280,275, now 250 because of 32 less shaders.

I can't wait for the real results ,this is ridiculous.
Click to expand...

At first it was 280 watts for the 480 GTX TDP. Then it became 275 watts.

After that we heard the 512 CUDA core version would be 295 watts, but the 480 core version would be 250 watts.
 
I could care less about power and heat. If I'm buying a high end card, I best have a high end case and power supply already.

I just want it to be fast and not too too exspensive.
 
happy medium said:
I could care less about power and heat. If I'm buying a high end card, I best have a high end case and power supply already.

I just want it to be fast and not too too exspensive.
Click to expand...
so you could not care less then? lol. anyway I care about it relation to performance. also power and heat usually translate into more noise which I cant stand.
 
Headfoot said:
This would place the GTX 470 even lower, perhaps even getting close to 200w TDP?
Click to expand...

While I'm trying to stay out of the Fermi threads because we don't have any hard data, this statement can be incorrect. Leakage varies a lot between chips, and a fully functional X shader chip may not meet the TDP requirements to become a GTX 480 and may be bumped down to a 470. Despite having some shaders disabled our theoretical 470 may still use more power than a less leaky 480.

There are a lot of examples of this: i7-975 using less power than a i7-920 D0 despite running faster. HD 5830 using more power than a HD 5870 despite having less shaders enabled.
 
Ben90 said:
Leakage varies a lot between chips, and a fully functional X shader chip may not meet the TDP requirements to become a GTX 480 and may be bumped down to a 470. Despite having some shaders disabled our theoretical 470 may still use more power than a less leaky 480.
Click to expand...

This is very true. Do you think they will bump voltage on the 470 to be able to use more dies?
 
How is TDP measured?

Doesn't Fermi have a lot of extra HPC features (that increase power usage) that wouldn't be used by a gamer?

Maybe those big heatpipes (designed for the extra loads of HPC) will give Fermi good overclocking headroom for games?
 
Computer Bottleneck said:
How is TDP measured?

Doesn't Fermi have a lot of extra HPC features (that increase power usage) that wouldn't be used by a gamer?

Maybe those big heatpipes (designed for the extra loads of HPC) will give Fermi good overclocking headroom for games?
Click to expand...

Since essentially 100% of electrical energy is converted into heat, they probably just measure power draw at a realistic load or running a realistic application (Crysis?).

TDP is not max power drawn though, it's an estimation of what a real world system will have to deal with under real world applications.
 
EarthwormJim said:
Since essentially 100% of electrical energy is converted into heat, they probably just measure power draw at a realistic load or running a realistic application (Crysis?).

TDP is not max power drawn though, it's an estimation of what a real world system will have to deal with under real world applications.
Click to expand...

Sorry, you are incorrect.

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

"The thermal design power (TDP), sometimes called thermal design point, represents the maximum amount of power the cooling system in a computer is required to dissipate."
 
OCGuy said:
Sorry, you are incorrect.

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

"The thermal design power (TDP), sometimes called thermal design point, represents the maximum amount of power the cooling system in a computer is required to dissipate."
Click to expand...

While this is true, things like furmark will often draw more power than the TDP of very many parts. Some companies must derive the value differently than just the hard maximum.

The maximum amount of power the cooling system is required to deal with and the maximum possible may not be the same thing. It would not be a surprise to me if I found out that the TDP is just the value they expect "reasonable" use to be at a maximum.
 
Daedalus685 said:
While this is true, things like furmark will often draw more power than the TDP of very many parts. Some companies must derive the value differently than just the hard maximum.

The maximum amount of power the cooling system is required to deal with, and the maximum possible may not be the same thing. It would not be a surprise to me if I found out that the TDP is just the value they expect "reasonable" use to be at a maximum.
Click to expand...

As a guy who runs 2 GTX 280s on a 750w PSU, I can tell you that TDP does not equal "normal use."

These are basic definitions.
 
OCGuy said:
Sorry, you are incorrect.

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

"The thermal design power (TDP), sometimes called thermal design point, represents the maximum amount of power the cooling system in a computer is required to dissipate."
Click to expand...
You need to read more than the first sentence when posting something like that. Read the whole article, then you'll see why you're wrong.
Daedalus685 said:
While this is true, things like furmark will often draw more power than the TDP of very many parts. Some companies must derive the value differently than just the hard maximum.

The maximum amount of power the cooling system is required to deal with and the maximum possible may not be the same thing. It would not be a surprise to me if I found out that the TDP is just the value they expect "reasonable" use to be at a maximum.
Click to expand...
Exactly, it's just a "guesstimate."
 
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