macbook pro 2018 How much cooling would the i9 Macbook Pro actually need?

[Eggicus Roundplumpius]

So, I've been wondering ever since this whole controversy, around Apple's new Macbook Pro with an Intel Core i9 processor that can't even hold it's base clock, started; how much cooling would the Macbook Pro actually need to keep this thing cool and even turboing to it's max, and what would that look like? Anyone who actually knows anything about sciencey cooling and stuff?

[Daniel644]

something like those desktop Ryzen based Asus laptops

[Pixel5]

well thats pretty easy to check, the CPU at base clock is rated with a 45W TDP so just to hold the base clock they need a cooler that can dissipate atleast 45W + what the GPU produces.

[genexis_x]

1 hour ago, whengaysattack said:

how much cooling

These can barely handle a 8950HK at stock settings. Undervolting (if no OC) and repaste (preferably LM) are highly recommended

[Rowschank]

Linus said "water is good enough, Mercury is not needed".  

 

Actually, you'd overheat and die with Mercury much sooner. Water takes more than twice the amount of heat as mercury does.  

 

Consider the point of equilibrium where the CPU will not be able to cool off immediately any more even with infinite throttling (i.e., turning off), where the liquid itself has hit 100°C, because the liquid will keep the CPU warm. Consider the room temperature, as well as a CLC sealing temperature to be 25°C.  

 

Mercury will be able to take about 143 kJ/l, while water will carry away 312.6 kJ/l (this is an obvious simplification because heat capacity also changes with temperature).  

 

The point being: liquid metal thermal paste is good because it conducts heat away quickly (a hypothetical water TIM that doesn't vapourise will just absorb all the heat at the interface, expand a lot, and never conduct it away because it sucks at doing so) and doesn't need to store it to ship it elsewhere. But water is a much better medium for absorbing and storing heat because it can take much, much more than most metals. 

[D13H4RD]

Something identical to what you'd fine in either one of the monstrosities or the MSI GE63. 

 

Ideally, it should be able to handle a combined 120W of heat at the very least for a combined CPU/GPU load. That's to keep base.

[Dschijn]

I think there should be 3 ways to improve the thermals:

 

1. use better thermal paste (e.g. liquid metal)

2. run a tool to overwrite the fan curve and make it more snappy (Apples fan curve is super slow)

3. improve the airflow and remove restrictions

 

regarding 1:

 

regaring 3:

https://medium.com/be-expert-101/my-macbook-is-too-hot-89afa1a0079a

[Pixel5]

6 hours ago, Rowschank said:

Linus said "water is good enough, Mercury is not needed".  

 

Actually, you'd overheat and die with Mercury much sooner. Water takes more than twice the amount of heat as mercury does.  

 

Consider the point of equilibrium where the CPU will not be able to cool off immediately any more even with infinite throttling (i.e., turning off), where the liquid itself has hit 100°C, because the liquid will keep the CPU warm. Consider the room temperature, as well as a CLC sealing temperature to be 25°C.  

 

Mercury will be able to take about 143 kJ/l, while water will carry away 312.6 kJ/l (this is an obvious simplification because heat capacity also changes with temperature).  

 

The point being: liquid metal thermal paste is good because it conducts heat away quickly (a hypothetical water TIM that doesn't vapourise will just absorb all the heat at the interface, expand a lot, and never conduct it away because it sucks at doing so) and doesn't need to store it to ship it elsewhere. But water is a much better medium for absorbing and storing heat because it can take much, much more than most metals. 

 

what exactly does this have to to with mercury, nobody is using or even trying to use mercury for cooling or as a thermal paste replacement.

 

when people refer to liquid metal they talk about gallium alloys 

[Rowschank]

12 hours ago, Pixel5 said:

 

what exactly does this have to to with mercury, nobody is using or even trying to use mercury for cooling or as a thermal paste replacement.

 

when people refer to liquid metal they talk about gallium alloys 

He spoke about it in the video.  

But even Gallium alloys wouldn't be as effective as water at absorbing lots of heat. 

[Froody129]

 

Laptops with beefy CPUs look like this for a reason 

[Pixel5]

6 hours ago, Rowschank said:

He spoke about it in the video.  

But even Gallium alloys wouldn't be as effective as water at absorbing lots of heat. 

but since you dont use the gallium to absorb heat, you want it to transfer the heat and here gallium is about 100 times better then water.