wy cant cpu's run hotter

[andre7455]

hello

 

i have a general question, a class mate of mine is telling all kind of wonderfull story's that i do not think are true but one story in perticulair interested me.

he sad that he baked a egg on a amd cpu (a old one so it wouldn't shut off) and got it to 200 c.

 

and i could not find out wy is was not true.

 

silocon can be 1000 c so  wy doesn't it run that hot?

 

can you guys help me out? tnx

 

kthxby

 

[iRileyx]

Pretty sure its because most solders(that hold the chips to the pcb) start to melt at around 180-190C

 

You'd also need to push some stupidly high voltage through to get the temperature to 1000C, at which point, the voltage would destroy the silicon before the heat does.

[emosun]

i dont think you can bake eggs

silicon by itself might be able to get to 1000c but microscopic cpu circuits cannot withstand heat and retain their shape , a few molecules move and the cpu becomes shorted out and can not longer function without every transistor working correctly.

[Princess Luna]

Because your processor isn't a brute rock of silicon.

[ARikozuM]

2 minutes ago, emosun said:

i dont think you can bake eggs

http://www.food.com/recipe/no-brainer-cheese-and-egg-souffle-232928

 

As temperatures increase, molecules begin to move move fluidly. I don't think any of the materials used in CPU's have a melting point below 1000C, but there's more to melting points than just the pure elemental melting points would indicate. I'm going to agree with @RKRiley's answer since solder typically melts at 180C. 

[Guest]

Generally, all CPU's have a temperature limit, when the CPU exceeds that temperature limit, the system will automatically shutdown. I wouldnt think that you could run a CPU hotter because if it gets too hot it would just catch fire due to the high temperatures. Frying eggs on a CPU would be kinda stupid, and besides, your mate probably put some ridiculously high voltage on the CPU with no heatsink on it with unstable temps which wouldve caused the CPU to catch fire. Frying an egg in a CPU would be impossible, because cracking the egg onto the CPU would leak all over motherboard, completely destroying your whole system. He wouldve probable had to make the CPU catch fire, then put a frying pan under the flame to cook his egg.

[Clockwork_princess]

There are small electronic parts inside a CPU. They break or get damaged and the CPU will die. 

 

It's not made out of just silicon. You have to use your brain and actually think. 

 

There are YouTube videos of people cooking meat like slices of ham on CPUs just to show how hot they get. But in Evey vidoe the CPU overheard and dies after 30+ seconds 

[fastcar123]

Another reason cpus and really all components cant run this hot is because as heat increases, resistance drops.

So by this logic, a hypothetical cpu running at 1.35V and drawing lets say 100A just for the sake of an example.

If this cpu has a resistance of 1Mohm this resistance will decrease as the cpu get warmer.

So perhaps for example sake again the cpu is running at 110c that resistance couldve dropped to maybe 500kohm.

At a voltage of 1.35V the current would effectively doubled to 200A which would be enough to kill the cpu.

 

[TVwazhere]

18 minutes ago, ARikozuM said:

http://www.food.com/recipe/no-brainer-cheese-and-egg-souffle-232928

Well shit. I just learned something

[emosun]

21 minutes ago, ARikozuM said:

http://www.food.com/recipe/no-brainer-cheese-and-egg-souffle-232928

well yeah obviously you can if you crack them , i made many a quiche in my day.

I was thinking they where whole uncracked eggs , which when baked just blow up.

[ARikozuM]

Just now, emosun said:

I was thinking they where whole uncracked eggs , which when baked just blow up.

Whoa! WHOA! That wasn't part of the agreement, sir/madam/John Wick! 

 

Seriously, you can hard-boil eggs in the oven quite easily. 

[emosun]

10 minutes ago, ARikozuM said:

Seriously, you can hard-boil eggs in the oven quite easily.

well no if they are hard boiled then they are boiled not baked

[ARikozuM]

3 minutes ago, emosun said:

well no if they are hard boiled then they are boiled not baked

https://www.familyfreshmeals.com/2012/11/how-to-make-perfect-hard-boiled-eggs-in-the-oven.html

 

Hard-boiled was probably the wrong term to use. 

[You_are_a_cunt]

Give me a blowtorch and I can get a CPU higher than 200C and sizzle some bacon on it.

Will it work afterwards? Hell. No.

Will there be bacon? Always.

[DocSwag]

CPUs always have a built in temperature limit. There are two main reasons for this:

1) As you increase heat the resistance goes up (since atoms are jiggling around more which blocks electron flow), which means you need more voltage to push the same amount of current through, which in turn means you're losing more power (since current was constant but resistance went up), so your CPU produces more heat which means it gets hotter even quicker and so on before eventually you get thermal runaway or the voltage isn't enough so your CPU shuts off.

2) This is the more important reason. As heat increases atoms are more likely to basically jiggle out of place causing degradation (you can learn more here)

Because of this cpus have temp limits usually around 100C, which means your friend is lying because their CPU would've shut off or throttled if it was that hot. If for some reason that temp limit wasn't there you would get severe degradation of your CPU which would result in it dying. Your friend is lying.

[KenjiUmino]

55 minutes ago, andre7455 said:

he sad that he baked a egg on a amd cpu (a old one so it wouldn't shut off) and got it to 200 c.

the egg-on-cpu story is nothing new and many people already tried to cook different kinds of food on different cpus 

 

 

i am not sure about the 200c part tho.

 

it is true that old AMD cpus had no functional overheat protection and did not shut off or clock down and would rather go up in smoke should the heatsink and fan fall off all of a sudden. 

 

but AFAIK that is only true for AMD CPUs that are like athlon-XP-old (they got this shit worked out on the athlon 64's)

 

i think CPUs actually can't go up to 200c - my bet is they will go up in smoke some 20-40 degrees earlier than that (possibly killing the mainboard as well and thus stop heating up further) 

[DocSwag]

32 minutes ago, KenjiUmino said:

i think CPUs actually can't go up to 200c - my bet is they will go up in smoke some 20-40 degrees earlier than that (possibly killing the mainboard as well and thus stop heating up further) 

I don't think they would actually literally go up in smoke rather than just dying or shutting off from not enough voltage.  

[KenjiUmino]

21 minutes ago, DocSwag said:

I don't think they would actually literally go up in smoke rather than just dying or shutting off from not enough voltage.  

old athlon XPs do go up in smoke.

 

tomshardware did a video on this back in the days comparing 4 CPUs.

 

if i remember correctly it was:

• socket A athlon
• socket A athlon XP
• socket 370 pentium 3 
• socket 423 pentium 4

what they did was pull the CPU heatsink off while the PC was runnig a game. 

 

pentium 3 crashed but survived - heatsink back on, reboot, all fine

pentium 4 clocked down until even quake 3 turned into a slideshow but this system survived as well.

 

both athlons let the smoke out and killed the mainboard. 

 

the thing is that none of the CPUs had a heatspreader. with the Die exposed so you could litteraly see the CPU Dies die.

 

oh wait, i found the video:

 

 

[Ezio Auditore]

There is something called the T-junction temperature and when it is reached because of some property of superconductors........

Okay, just read this

https://en.m.wikipedia.org/wiki/Junction_temperature