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"After PC Shutdown, Water Cooling Continues..." - Page 4

post #31 of 36
It does apply. You turn off the power, that chip stops generating heat. The coolant still flows. Said chip cools faster than if left to cool naturally.
 
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post #32 of 36
My take on this is simple...

When you shutdown your pc the cooling system stops too, but you still have that loop passively cooling the components as heat dissipates into the almost motionless water.

I only have to question why the heck this would actually benefit you?

Consider that all the stock and air cooled systems out there immediately have their fans stop once the PC shuts down.

All they have now is a passive heat sink and I am willing to bet that our loops have much more ability to handle that minute amount of heat from power down under load than a dinky Intel stock cooler.

Hey, if you want to set it up for the hell of it, we won't stop you, and many above have provided great input on how to accomplish this.

Just know that for the sake of making it known...this will not prolong the life of your chip. They are designed this way...

Think of a car cooling system which runs a heck of a lot hotter...those electric/thermostat driven fans only continue to spin after you shut the car off once in awhile on a super hot day.

That is on newer cars...My old ass 91 Jimmy has a direct drive fan and it only spins when the engine is cranking away. I never overheat, nor have I had any issues with overheating.

Plus an engine block sure as heck does not dissipate heat as quickly as some small micro chip that has a dedicated loop on it.

just my 2cents.gif
post #33 of 36
Thread Starter 
I'm running oc'd all-the-time w/intel n/s chip raid ssd's sata3.0 - so waterblocks on cpu, n/s chip & gpu.

Inside silicon of cpu / n/s chip / gpu max temps are not uniform -- even @ 22/24nm there exists temp gradients/zones & some are v. hot (higher than average temp you see on monitor).

I appreciate all comments & suggestions, although mfr wattage specs have decreased (based on aggressive thottling) with each die shrinkage, max temp tolerance of transistor junctions decreases (lower tolerance for temp spikes) whether "on" state or "off" state.

As I have experience transient in-stability with sata 3.0 components (not sandforce controllers) after bios/driver/firmware issues resolved - thermal in-stability must be considered. Also, I continue to be concerned regarding silicon thermal fatigue tolerance.
post #34 of 36

This whole endeavor is unneeded...

 

Thermal load is cut off @ the same point as CFM. There is no longer any source of thermal load and ambient temps within that system (once off) will slowly normalize.

 

Nothing heats up after you shut off the computer, heat just dissipates. Keeping the flow only makes the heat dissipate faster, not more.

post #35 of 36
Quote:
Originally Posted by buildtoexcess View Post

I completely agree that no individual pc user is presently doing this, however in emergency shutdowns of large server arrays, coolant keeps flowing.

that's because the pumps aren't powered by the rig's psu. It's a completely separate system. Just hook it up outside the rig, can probably set this up in less than an hour.

Quote:
Originally Posted by buildtoexcess View Post

You're refering to "thermo-syphons" which require rather low flow resistance to work correctly.
The only real world performance application was two-stroke single cylinder trials & road racing motorcycles of the 50's & 60's - true thermo-syphon cooling systems, but unable to maintain cylinder head operating temp if combustion temperature suddenly increased (lean burn condition).
Coolant flow rates in pc systems must be moderately high to quite high when aggressively oc'g or fans are simply blasting away - thermo-syphon flow rate (no pump / pc system) is low due to multiple water blocks & radiator design - coolant temp rise quite rapid even if fan(s) are run max rpm.
Actually the most successful application of the thermo-syphon principle is the present day "cross flow" automobile water radiator - water already cooled in radiator develops increased density and settles to "bottom" of radiator assisting water pump flow.

completely untrue. It all depends on how the cooling system is set up, where heat is dissipated, in what order, and the design on the blocks. There's no chance that my setup is over 1gpm, but it still pushes a <3c delta at 1480watt tdp (as converted for 80% efficiency from the wall). There's more than just flowrate to creating a solid loop. It's been shown that it really doesn't matter that much by the forum member that had 24 d5 pumps in his rig. It performed like crap.
Edited by fat_italian_stallion - 4/7/12 at 10:40am
 
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post #36 of 36
If you're worried about thermal fatigue, leave it on 24/7. Forcing parts to cool down rather than let them cool off naturally is more fatiguing. Hot glass cools fine on its own, but put it in water and it shatters.
 
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