prove someone wrong

[Tom_nerd]

I was trying to explain to someone Nvidias new feature that changes the power of the CPU and GPU to match the workload, for example in gaming it might prioritise the GPU and not the CPU, anyway I was half-way through explaining it and I said that if you put 100 watts of electrical energy into a CPU then 100 watts of heat energy has to come out of it, but he wont accept that.

 

thanks in advance.

[minibois]

46 minutes ago, Tom_nerd said:

I was trying to explain to someone Nvidias new feature that changes the power of the CPU and GPU to match the workload, for example in gaming it might prioritise the GPU and not the CPU, anyway I was half-way through explaining it and I said that if you put 100 watts of electrical energy into a CPU then 100 watts of heat energy has to come out of it, but he wont accept that.

https://en.wikipedia.org/wiki/Joule_heating#Heating_efficiency

Quote

As a heating technology, Joule heating has a coefficient of performance of 1.0, meaning that every joule of electrical energy supplied produces one joule of heat.

The videocard uses power, a by-product of that power is heat. The videocard does not use heat. Thus 100% of all power used & heat generated (both measured in Watts) is a by-product of running your computer.

So if you use 120W of power, you will output 120W of heat. 

 

I don't know which this is, but I am sure this is covered by one of the laws of thermodynamics.

[Tom_nerd]

thanks @minibois

 

[geo3]

10 hours ago, Tom_nerd said:

I was trying to explain to someone Nvidias new feature that changes the power of the CPU and GPU to match the workload, for example in gaming it might prioritise the GPU and not the CPU, anyway I was half-way through explaining it and I said that if you put 100 watts of electrical energy into a CPU then 100 watts of heat energy has to come out of it, but he wont accept that.

 

thanks in advance.

I think your friend is right. There's this law of physics called conservation of energy. If 100% of the energy put in comes out as heat that means literally no other work can be done. It takes some non-zero amount of energy to flip transistor gates back and forth. 

[Tom_nerd]

19 hours ago, geo3 said:

I think your friend is right. There's this law of physics called conservation of energy. If 100% of the energy put in comes out as heat that means literally no other work can be done. It takes some non-zero amount of energy to flip transistor gates back and forth. 

although he thinks that the thermal energy can not be measured in watts and that the amount of energy going in has no correlation to the amount of heat going out.

[Grabhanem]

19 hours ago, geo3 said:

I think your friend is right. There's this law of physics called conservation of energy. If 100% of the energy put in comes out as heat that means literally no other work can be done. It takes some non-zero amount of energy to flip transistor gates back and forth. 

If you look at the entire computer as a system, it has to be almost entirely heat. There is one way energy goes in-- electricity. There are 3ish ways it comes out-- heat, light, and motion. Unless you have a ridiculously RGB-blinged system, light and motion (think air currents from fans) are going to be a watt or two at most, so the vast majority will be heat.

 

(The others will eventually become heat as well-- the air currents will dissipate via friction, and the light will be absorbed by the walls and warm them slightly.)

[Tom_nerd]

6 minutes ago, Grabhanem said:

Unless you have a ridiculously RGB-blinged system

I can tell you don't know me

[geo3]

2 hours ago, Grabhanem said:

If you look at the entire computer as a system, it has to be almost entirely heat. There is one way energy goes in-- electricity. There are 3ish ways it comes out-- heat, light, and motion. Unless you have a ridiculously RGB-blinged system, light and motion (think air currents from fans) are going to be a watt or two at most, so the vast majority will be heat.

I though we were referring to just the CPU. Also electricity comes out as well. Granted that the majority of energy leaving the CPU is heat, but it's definitely not 100%