Noisy iMac when playing steam games

[xrayspecs]

I have noticed a ticking/clicking noise (loudest all along the top) when playing games such as Half Life 2 and Assassins Creed II using Steam.
Also randomly what can only be described as a turbo fan will start up (bottom left) and can only be stopped with a shutdown.

iMac 27" i7 Mid 2011 12GB RAM 2GB VRAM HD 6970M

When I check istat pro everything seems normal, also have run the hardware diagnostics at startup with no problems found.

Anyone else?

 

[ugp]

I get the loud fan as well. The fan maxes out and doesn't slow down. Seems to be a glitch in the sensor or something. I've had the problem since I bought mine.

 

[MacHamster68]

, it might not be a glitch , its a quiet powerful gpu in that small space , and as such get quiet warm under heavy use and gaming is heavy use , so apple might have set it up to avoid overheating
normally everyone is worried here if the fans dont kick in full speed and install fan controllers to get the iMac's run cooler when gaming

 

[Ubuntu]

I have noticed a ticking/clicking noise (loudest all along the top) when playing games such as Half Life 2 and Assassins Creed II using Steam.
Also randomly what can only be described as a turbo fan will start up (bottom left) and can only be stopped with a shutdown.

iMac 27" i7 Mid 2011 12GB RAM 2GB VRAM HD 6970M

When I check istat pro everything seems normal, also have run the hardware diagnostics at startup with no porblems found.

Anyone else?

Same iMac as you and when I play Battlefield or Just Cause 2 on steam I don't get any sounds like that. I'd get that looked at.

 

[xrayspecs]

Same iMac as you and when I play Battlefield or Just Cause 2 on steam I don't get any sounds like that. I'd get that looked at.

Thanks for letting me know, this will help on the call with apple.

 

[leon2arts]

Thanks for letting me know, this will help on the call with apple.

i just send out for a replacement my 1-day old imac 27 for this reasson.

Mine had the cpu fan maxed out right from the boot! the cpu fan was running at 3600 rpm (the noise was very LOUD!) and the temp was just ~ 28-31
i contacted apple and they said that the temp sensor on the cpu was deffective.

call them and check it up, its not normal to max the fan like that (if the temp is not beyond normal)

hope it helps