Rumor: GTX 480 TDP is actually 250w

[Headfoot]

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

 

[cbn]

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.

 

[happy medium]

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.

 

[bunnyfubbles]

I heard that nVidia solved all the problems with Fermi by powering the cards with the hearts of young orphan boys.

 

[toyota]

is the 26th still the big day for info or did that officially get changed?

 

[cbn]

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.

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.

 

[happy medium]

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.

 

[toyota]

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.

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.

 

[OCGuy]

I heard that nVidia solved all the problems with Fermi by powering the cards with the hearts of young orphan boys.

Actually they use the blubber of baby seals.

 

[happy medium]

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.

Noise bothers me a bit, yea. But I keep my 7 fans on low and it doesn't bother me.

 

[Ben90]

This would place the GTX 470 even lower, perhaps even getting close to 200w TDP?

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.

 

[Ares202]

HD 5830 using more power than a HD 5870 despite having less shaders enabled.

that is because the 5830 has a higher voltage, to get the most out of the faulty cores

 

[TemjinGold]

At the rate these TDP rumors are changing, Fermi TDP will probably be 100 watts by the time it releases...

 

[MrK6]

At the rate these TDP rumors are changing, Fermi TDP will probably be 100 watts by the time it releases...

And only have 128 shaders. This just in, Fermi is a rebadged 8800GTS/9800GTX/GTS 250 .

 

[BD231]

What a circus

 

[Headfoot]

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.

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

 

[Headfoot]

NEW INFO:
http://www.fudzilla.com/content/view/18183/1/

Fudzilla is saying that the GTX 470 will have a 215w TDP. Maybe we will still see 200 watt actual power use numbers after all...

 

[cbn]

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?

 

[EarthwormJim]

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?

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.

 

[RussianSensation]

What a circus

Let's all be friends ()

http://forums.anandtech.com/showthread.php?t=2061179

 

[OCGuy]

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.

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."

 

[Schmide]

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."

He's pretty right btw. I believe he's basically saying a chip can go beyond TDP regardless of what they design to.

 

[Daedalus685]

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."

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.

 

[OCGuy]

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.

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.

 

[MrK6]

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."

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.

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.

Exactly, it's just a "guesstimate."