Why does smaller = less heat?

[リチャード]

So I remember hearing that the smaller chips generate less heat.. but that makes no sense to me.

 

mITX builds are generally hotter over-all, because you have a bunch of heat generating parts in a small vicinity => heats up faster. And more than that, bigger rads etc. can spread the heat over a bigger area to dissipate more heat...

 

But then suddenly, if a chip is smaller... it generates less heat? Shouldn't a 40nm chip be cooler than a 22nm, since we can dissipate heat from a larger area faster just like with the other heatsinks?

 

In physics we learn early that E = C x m x ∆T ==>  ∆T = E/(C*m) ==> Smaller mass = larger ∆T ==> A smaller chip (e.g. 22nm vs 40nm) should generate more heat, and not be able to dissipate it as easily. But apparently, this is incorrect... could someone explain why that is?

[Fred Castellum]

Smaller chip less power > less power less heat

[qwertywarrior]

smaller transistors = less resistance = less heat

die areas normally stay the same because they take advantage of the smaller node and add more transistors

[Enderman]

Are you talking about the die size or chip size or manufacturing process? Most chips are more or less the same size. What is different if that when more transistors are squished into a smaller area (smaller manufacturing process) they generate more heat. BUT efficiency is also increasing with each generation, and a 22nm die will use less power than a 40nm die, and therefore create less heat.

[Nineshadow]

Going to a smaller manufacturing process reduces the transistors' size,which in turn reduces the electrical resistance.They also get more power efficient,which also contributes to the smaller heat output.

[Enderman]

smaller transistors = less resistance = less heat

die areas normally stay the same because they take advantage of the smaller node and add more transistors

That is not what intel has been doing lately. 3770k, 4770k, most of their chips have similar #s of transistors even though they have been reducing the manufacturing process. Smaller manufacturing process does increase the efficiency, but it also creates more heat because all the transistors are closer together. A lot of the extra space is being used for the integrated GPU

[JLCitadel]

i believe if they took whats a 22nm and put it on a 40nm but spread out it would generate the least heat of all

[qwertywarrior]

That is not what intel has been doing lately. 3770k, 4770k, most of their chips have similar #s of transistors even though they have been reducing the manufacturing process. Smaller manufacturing process does increase the efficiency, but it also creates more heat because all the transistors are closer together. A lot of the extra space is being used for the integrated GPU

3770k has a crappy tim that increased heat a lot

4770k  had VRM integrated on the the chip  with crappy tip

the new  haswell refresh has improved TIM and the temps are much better

 

 u need to look at the performance per watt to gauge its efficiency

 

[Izaya Orihara]

A smaller die will generally ( almost always) use less powert than a bigger one. But it is true that smaller dies get hotter faster than bigger dies. That is why AMD chips run cooler than Intel chips against popular belive. 

[Enderman]

3770k has a crappy tim that increased heat a lot

4770k  had VRM integrated on the the chip  with crappy tip

the new  haswell refresh has improved TIM and the temps are much better

 

 u need to look at the performance per watt to gauge its efficiency

 

I was taling about the transistor count in the 4770k vs 3770k which both have 1.4 billion

I already know that the 4770k is more efficient...

Did you read my post at all?

[リチャード]

Ah, I forgot to look at the electrical components in this

 

E = C x m x ∆T is mainly for looking at the overall heating of larger bodies.

 

So smaller transistors => lower resistance => less heat generated? I haven't worked a lot with that stuff in physics... yet, but it's good to know beforehand.

 

 

Thanks, everyone

[qwertywarrior]

I was taling about the transistor count in the 4770k vs 3770k which both have 1.4 billion

I already know that the 4770k is more efficient...

Did you read my post at all?

i missed that

4770k and 3770k have similar number of transistors because of the tick tock  strategy intel has been using since pentium

shrink > architectural change > shrink etc