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Fan timers

i believe electronics prefer to be cooled down slowly. if you have a fan continue spinning after the pc has shutdown, the temperature would decrease at a faster rate. any thermodynamic guru can probably answer better than me.
 
atleast I finally understand how they work. The thing is hooked to the MB fan power connectors & the ATX power leads. so, it's drawing it's power from the 'ready' 5V connection. So, it undervolts the fans @ 5V after the system stops, then switches to the 12V MB power once it's running.

I just wonder if these are completely bogus because every review I've found shows your temperature does not increase after the system stops
 
That smacks of bad physics, the CPU temp doesn't skyrocket as the thing stops generating heat at the same time as the fan stops spinning. As such the temps aren't going to skyrocket.

I would only risk touching them with a bargepole in order to hit the person trying to sell them to me.
 
Originally posted by: Bobthelost
That smacks of bad physics, the CPU temp doesn't skyrocket as the thing stops generating heat at the same time as the fan stops spinning. As such the temps aren't going to skyrocket.

I would only risk touching them with a bargepole in order to hit the person trying to sell them to me.
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what he said... how you can test this is just run prime 95 or something for 12 hours a nd turn it off.. ur cpu temps will drop... similar happens when shutting off...


marketing gimmick
 
Originally posted by: 64ninjas
http://xoxide.com/nexus-prolong.html
http://xoxide.com/evercool-extended-cooling-system-gt365.html

I've seen these fan timers that keep your fans running after the system has shut down. Are these even useful? and if so, how do they keep working after the power is turned off?
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Something like that *might*be a good idea for driving the pump on a WCed system in the event of having to shut down immediatly dad says,"We are leaving"and you in the middle of a full stress test, so no it's not needed.
Sinks will absorb lots of heat after shutdown.
The fluid in heat pipes will continue it's journy to the cooler finned area.
If the radiator is mounted higher than the sinks, thermal flow will continue just as hot air rises and cool air falls, so it is true in a liquid cooled system, as long as the pump is NOT a positive displacement type.
In the old olden days, 1920's, many water cooled gasoline engines had no water pump, but relied on thermal flow. Once moving the coolent will pick-up alot of speed. Quite amazing really.


...Galvanized

 
Neither have any battery. They both use the 5VSB rail to keep the fans going until the device times out - so you'd best not be planning to hook any high-powered fans to them.

Inline,
. At 5V there's not gonna be any quick cooling going on... 😉

.bh.
 
I wouldn't worry about it, but I have seen measured temperatures rise slightly in the case after shutdown. It's not generating more heat, but neither is it dissapating it as well as it is when the fans are blowing, so the temps can be hotter than they were with the fans running.

But don't take my word on this, check it yourself.

This is also a built-in feature of some Enermax power supplies, among others probably.

Edit: As I recall, many projectors do this too. I'm sure that nobody would want those fans to keep on running if there wasn't a good reason for doing so.
 
This would be for exhaust fans, and not CPU fans as was implied earlier.

The electronics in the case have stopped generating heat, but it is built up inside. A few minutes of only the exhaust fan running should suck out any built up heat.

They're not necessary though.
 
Originally posted by: crispy2010
Anyone think this might be good to extend life of hdd, they hold a lot of heat after shutdown!
Click to expand...

In short, no. The HD gaining a few degrees (even that much is unlikely i doubt you'd see any temperature rise) for a few seconds as it shuts down is a negligable factor imo.
 
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