al360ex

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^Yep.
The lower the TDP is, the lower the power (watts) requirement will be. And the lower the wattage(W) is, the lower the amperage (W=V*A) will be, the voltage being always at 12V in a computer.

So a lower amperage (or current) means less heat.
 

mubin

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Thats for high end cpu with same cpu tech. Right? New cpu with with new tech, like 22nm tech will be less in TDP than current cpu tech with same performance class.

Cpu manufacturer want to reduce TDP from their new cpu. Their one of the primary object is to reduce TDP in new production with high performance. So less TDP is better in my point, energy efficient. :)
 
It's not better - it just has lower TDP.

A dual core CPU will have a lower TDP than a quad core in the same family, like Sandy Bridge:
Core i5-2500K 3.3Ghz quad core = TDP 95W
Core i3-2120 3.3GHz dual core = TDP 65W
Core i3-2120T 2.6Ghz dual core = TDP 35W

In this example higher CPU performance comes with higher TDP. And for many people, like gamers, that's a pretty good thing.

 
Same is true of Ivy Bridge 22nm CPUs:
35W TDP Core i5-3470T 2.9Ghz has lower performance than 77W TDP i5-3570K 3.4Ghz CPU.
intel-ivy-bridge-desktop-cpu-world-small.jpg
 

mubin

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Why not better? Between i5-2500k and i5-3550, which processor will you buy? Is 95w i5-2500k is better than 77w i5-3550? Hopefully not. They both have 3.3ghz quad core and supports same mobo.

In the same family, max TDP is better for performance as you said before. But in different family, lower TDP is better. Am i wrong again :??:
 

mubin

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Why not better? Between i5-2500k and i5-3550, which processor will you buy? Is 95w 2500k is better than 77w i5-3550? Hopefully not. They both have 3.3ghz quad core and supports same mobo.

In the same family, max TDP is better for performance. But in different family, lower TDP is better. Am i wrong again :??:
 
Possibly.
If you compare Sandy Bridge i5-2500K 95W to Ivy Bridge i5-3470T 35W TDP there is a wide CPU performance gap in favor or i5-2500K.

You might say: Between CPUs with similar performance the one with the lower TDP uses less energy and has less waste heat.


 

mubin

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:lol: :lol: I forgot not to mention about desktop vs mobile.

You might say: Between CPUs with similar performance the one with the lower TDP uses less energy and has less waste heat.

Trying to say that. Less heat/ low TDP is always better for overclocking cpu.
 

Max1s

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Well the 3rd gen sandy bridge has a lower tdp because of the smaller die size, but that means tighter heat concentration, and they also use a new kind of crap heatspreader, so the 3rd gen cpus run hotter.

Smaller die size/manufacturer process = smaller TDP (good)
More cores, faster clocks = more TDP (also good in this case)

Dont think about it too much. It only helps to determine power consumption and general amount of heat produced. ;-)