RayLopez99 wrote:
On Monday, April 15, 2019 at 8:19:11 PM UTC-4, Flasherly wrote:
AMD FX-Series FX-4100 Zambezi FD4100WMW4KGU Socket AM3+ 95W CPU

Burnt like hell when I touched the heatwick pipes.


In fact, if you're looking for a CPU you want to take a 2lb.-mallet
to, I'm your guy.

What is the maximum temperature of PCs now, about 100C? Boiling water hot?

RL

That's the junction temperature max.

The heatpipes should not run that hot, because the
cooling fins bonded to them, provide some cooling
effect, and the pipe can't get quite as hot.

If the fan stops, then the pipe could rise to
closer to the junction temperature.

With the fan running, it really shouldn't go over
65C like Flasherly is proposing.

At around 20C more than Tjmax, the computer will shut
off via PROCHOT (hardware protection, no signal that
computer is going off is sent to the OS). That powers
off the ATX power supply by deasserting PSON.

If a heatpipe loses the cooling fluid inside, the
pipe cannot get as warm, as the copper doesn't
conduct nearly well enough to burn someone when the
pipe is empty. When the working fluid is present,
the liquid/vapor phase transfer is much more effective
at transmitting the heat out to the pipes.

If you overload a cooler, all the liquid in the pipes
is in the vapor phase, and cooling is again, reduced.
Make sure the cooler is intended for the applied load.
If you push 400W in an overclock, of course a 95W
cooler is going to be "overwhelmed". And the pumping
action in the pipes stops, because liquid can no longer
condense. Each heat pipe collection, has a "max power".

On my 156W processor, the CPU runs at 45C, and that's
because the cooler is *huge*. You won't find any scalding
pipes on that thing. But the cooler is so big, it's hard
to work inside the PC.

Paul