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Anyone have anything fanless in their PC that usually has a fan?

My current power supply is 650W but the fan sometimes gets stupid loud so I'm thinking of going fanless with 500W. The PC doesn't use more than 250W when idle.

I use a PSU which has a fan which only goes on when over a certain temperature (so is always off really), and have fanless heat sinks for the graphics card and CPU.

Basically no fans run in my PC, but I have some temperature controlled fans as a backup, which kick in when the temp gets over a certain value. One is directed at my Pulsars with the sensor in between them.

I usually buy my fanless components from QuietPC, see http://www.quietpc.com/powersupplies for some quiet PSUs. I use a Nesteq one myself.