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Relation between heat output and wattage

post #1 of 15
Thread Starter 
Hey OCN.
I was just wondering... do different chips have different temperatures at the same watt level(with the same cooling of course)?
Would a Core2Quad Q9550 @ 150 watts with X cooler have the same temperature as a i7 920 @ 150 watts with X cooler? Or would it be different?

Any information on the subject will be much appreciated!
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post #2 of 15
No, shouldn't be. Conservation of matter mass and energy.
For instance, a lot of people think of going water cooling because their rooms are too hot. They think that because their hardware isn't reaching the temperatures it used to means that the extra heat is gone. It's not, in fact their rooms will get warmer faster. The water cooling is more efficient are dispersing the heat into the enviornment.
Edited by Smykster - 3/2/11 at 1:03pm
post #3 of 15
Hi.

No, will not be the same. Both CPU are Intel but also both use different socket and voltage.

The heat depend of voltage that you use for the CPU, and in that way the i7 line use less voltage for better performance.
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post #4 of 15
Wattage output is in this case, a measurement of energy being released as heat.

The temperature seen will be a direct result of how efficiently you are removing that energy and dissipating it into the surrounding air.

Taken from wiki

Quote:
In terms of electromagnetism, one watt is the rate at which work is done when one ampere (A) of current flows through an electrical potential difference of one volt (V).



Two additional unit conversions for watt can be found using the above equation and Ohm's Law.



Where ohm (Ω) is the SI derived unit of electrical resistance.

Edited by Tw34k - 3/2/11 at 1:06pm
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post #5 of 15
Watt level is the TDP. TDP is the Maximum power that CPU is allowed to use under stock conditions. Individual CPUs (even the same type IE: i7 2600k) will be binned to run at different stock voltages and thus, some will run cooler than others while still being the same TDP.
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post #6 of 15
Of course every chip is different, but a Q9550 using 100w and an i7 using 100w will both put out the same amount of heat.
post #7 of 15
Quote:
Originally Posted by ScurK View Post
Hey OCN.
I was just wondering... do different chips have different temperatures at the same watt level(with the same cooling of course)?
Would a Core2Quad Q9550 @ 150 watts with X cooler have the same temperature as a i7 920 @ 150 watts with X cooler? Or would it be different?

Any information on the subject will be much appreciated!
Assuming you mean 150w input and not output?


Quote:
Originally Posted by Smykster View Post
No, shouldn't be. Conservation of matter mass and energy.
For instance, a lot of people think of going water cooling because their rooms are too hot. They think that because their hardware isn't reaching the temperatures it used to means that the extra heat is gone. It's not, in fact their rooms will get warmer faster. The water cooling is more efficient are dispersing the heat into the enviornment.
Quote:
Originally Posted by saint19 View Post
Hi.

No, will not be the same. Both CPU are Intel but also both use different socket and voltage.

The heat depend of voltage that you use for the CPU, and in that way the i7 line use less voltage for better performance.
Quote:
Originally Posted by Tw34k View Post
edit

Yes, it can and will be different.

Wattage represents rate of energy conversion.
Temperature is the thermal energy held.

i.e. A 1m^3 hot plate will have a different temperature from a 1cm^3 hot plate if all else is the same and both are converting 100w of electrical energy to heat.

Quote:
Originally Posted by Smykster View Post
Of course every chip is different, but a Q9550 using 100w and an i7 using 100w will both put out the same amount of heat.
There is a slight difference in heat output due to differences in efficency.

Also, even if the amount of heat output is the same, the temperatures can still be different.
Edited by DuckieHo - 3/2/11 at 1:10pm
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post #8 of 15
Quote:
Originally Posted by DuckieHo View Post
Yes, it can and will be different.

Wattage represents rate of energy conversion.
Temperature is the thermal energy held.

i.e. A 1m^3 hot plate will have a different temperature from a 1cm^3 hot plate if all else is the same and both are converting 100w of electrical energy to heat.
Of course heat transfer from watts to the environment is based on surface area, but both surface areas of the chips are quite similar.
post #9 of 15
Quote:
Originally Posted by Smykster View Post
Of course heat transfer from watts to the environment is based on surface area, but both surface areas of the chips are quite similar.
But he's asking about temperture.
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post #10 of 15
Quote:
Originally Posted by DuckieHo View Post
But he's asking about temperture.
Hahaha whoops. Sometimes I forget to read the fine print. Thanks for making me look like a fool duckie.
Edited by Smykster - 3/2/11 at 1:16pm
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