Changed fan in PSU.

[adbee]

Hi,

I have just changed the fan in my EVGA 750w PSU as it was really loud.

I have put a Noctua 120mm fan in there, just soldering the neutral and 12v wires.

When I turn the system on the fan powers up perfectly then switches off or stutters for a bit. I put a game on to check that the fan came on if the psu got hot and it did. It seem that the Noctua fan needs more power to get it spinning than the stock fan.


So when the power supply gets hot or is using more power the Noctua fan spins, but it switches off in normal use. The old fan ran all of the time, is this going to be a problem?

 

[adbee]

Without airflow you may find hot spots in the PSU are not cooled. A semi fsnless psu will be heatsunk to allow for these idle times,yours won't be. That said only time will tell. If your PSU fails in 6 months due to capacitor leakage or switching transistor failure then you'll know why.

I'd recommend against the use of pwm fans in a PSU as they sometimes fail to spin at lower voltages. That a 3 Pinner would happily spin at.

Well that is annoying, I might just buy a new PSU in that case, cant face replacing the fan again.

Any recommendations for something quiet and can power sli 670's?

 

[adbee]

It's a decent PSU so I'd just run with it if you don't fancy the rework. If it does fail it isn't likely to take anything with it.

And yes as above you could do that but also you could have the fan wired up to your CPU PWM if you are half decent with wiring.

That was my main concern, damaging other components if something happened to the psu.

Thanks for the help guys anyway, think I will roll with it and see how I get on.