HX650 fan never spins

[Jose Munoz]

i played skyrim with over 50 mods at ultra using these specs
i5 3570k @ stock
gtx 760 @ stock
8 gb
1tb

i know the fan only spins with load, but isn't that enough? the gpu gets 60C and the CPU gets 50C i call that load. It only spins up on startup but thats it, and when I touch the HX650 its hot to the touch.

 

[Dark Lord of Tech]

Those temps are low , I wouldn't consider them load temps.

Your PSU fan will come on when it needs it , don't worry.

Quiet cooling An ultra-quiet, 140mm double ball-bearing fan delivers excellent airflow with exceptionally low noise levels by varying fan speed in response to temperature.

When it get's the proper load , it will kick on.

 

[ko888]

The fan is suppose to remain off (i.e. fanless mode) until the power draw reaches 260 Watts or more.

 

[photonboy]

Hi,
Use Prime95 to stress your CPU. If you don't observe the CPU spin up, start a game benchmark AS WELL.

The 260W threshold is correct:
http://www.corsair.com/en/power-supply-units/hx-series-power-supply-units/hx-series-hx650-power-supply-650-watt-80-plus-gold-certified-modular-psu.html

Other:
I saw a benchmark of a GTX760 system showing about 300Watts using the Heaven Benchmark so you can try that as well to see if your fan speeds up. It's reasonable for you to be gaming just under 260Watts though because this benchmark program would not be capped to 60FPS (VSYNC) so you would be stressing the GPU more than normal (perhaps the CPU not very much though).

So again, the Heaven Benchmark should easily push you to about 300 Watts using these settings:
Settings

Unigine 4.0 Heaven Benchmark
1920x1080 Resolution
8x AA
15-minute load test
15-minute idle test

(probably the fan would spin up within two minutes)