smcFanControl 0° but back of iMac 27" is hot

[Air2]

The back of my new iMac (mid-2011 27" Ultimate) is hot and even CDs are warm after copying, so I installed smcFanControl. It reads 0°C and 1224 rpm on the ODD, 1100-1426 rpm on the HDD and 939 rpm on the CPU. Should I be worried?

 

[flatfoot]

The back of my new iMac (mid-2011 27" Ultimate) is hot and even CDs are warm after copying, so I installed smcFanControl. It reads 0°C and 1224 rpm on the ODD, 1100-1426 rpm on the HDD and 939 rpm on the CPU. Should I be worried?

Which sensor reads 0°C? Please list all temperature sensor values smcFanControl displays.

 

[Air2]

Which sensor reads 0°C? Please list all temperature sensor values smcFanControl displays.

The program does not list the sources of its readings. It currently shows
0°C 1448 rpm if I set ODD in Preferences
0°C 1451 rpm if I set HDD in Preferences
0°C 1199 rpm if I set CPU in Preferences

Thanks for your help.

 

[Air2]

I just installed TemperatureMonitor.dmg to supplement the information. It is not designed for the current iMac, so it might not read all temperature sensors. The ones it reports are
24°C for Ambient Air
45°C for CPU A Heatsink
53°C for CPU A Proximity
51°C for CPU Core 1
46°C for CPU Core 3
50°C for CPU Core 5
47°C for CPU Core 7
55°C for Display Screen Proximity
68°C for Graphics Processor Heatsink 1
76°C for Graphics Processor Temperature D
54°C for Main Logic Board
51°C for Optical Drive
65°C for Power Supply Position 2
63°C for Primary Heatsink
45°C for SMART Disk Apple SSD
59°C for SMART Disk Hitachi
72°C for Secondary Heatsink

Can anyone compare that to their values?

Current room temperature is 24°C (up from 22°), so the iMac is heating my room.

 

[rj86]

Mine is the same, would imagine it's the fact they've not had their temp sensor profiles added yet.

 

[Spike88]

Hi there...

At this point in time, the SMCControl program isn't a perfect program. The same program on my 2010 iMac shows a "0" value for its internal HD reading as well. But, iStat Nano (free widget from iSlayer) shows the RPM and temp numbers properly.

For readings on my iMac (ony my 2010 - 21.5" model), see:
http://i178.photobucket.com/albums/w251/Spike99-Pictures/New iMac system/FanSpeedJune25-2011.png
http://i178.photobucket.com/albums/w251/Spike99-Pictures/New iMac system/InternalTemps2010-08-30.png

Note: I set my iMac fans to "minimum" 1400 with threshold of 75 C. This keeps my iMac much cooler. Especially under heavy loads.

Hope this helps in your iMac 27" research....

.

 

[philipma1957]

I went a step further and purchase istatmenus

http://bjango.com/mac/istatmenus/

cost is 16 dollars for 1 computer and 25 for family pack. it allows 6 fans speeds. my slowest speed is very quiet so I set the machine at slow but when I want I can really speed it up with the fast setting. for a 1600 dollar plus computer the amount of control a 16 dollar program allows is worth it.

 

[cooky560]

smcFanControl says 0c for me too, but it still controls the fans and it seems to work well enough