iMac Temps
14 Feb 2010 0:46:41 UTC
Topic 194773
(moderation:
I have an iMac with a 3.06 Ghz Intel Core 2 Duo.. I had it since May 2008. It had two warranty failures since I got it. First was a power supply. Second was a graphics card. I decided to download istat to see what kind of temps I have. I have been running Bionc balls to wall mostly ( 2 Processors 100 %). The CPU runs at about 90 to 95 degrees C. Power Supply about 85 degrees..
I have reduced CPU usage to 50 % with 1 processor for the time being
it runs a little cooler CPU 80 to 85 degrees.. Power Supply about the same. Ambient temp about 26 degrees
I need to know at what temp is good. I think I will stick with this set for a while
There are some who can live without wild things and some who cannot. - Aldo Leopold
iMac Temps
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That's still dangerously high. x86 chips are typically rated to 100C but that's the rapid self destruct/thermal throttle point. You don't want your temps to be above ~70C over the long term unless you're willing to sacrifice your systems longevity by a large amount.
I'd pop the cover off check that its cooling fans are all working and that the heatsinks aren't clogged with dust.
RE: RE: I have an iMac
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Thank you for responding.
I just got this thing back from warranty repair
Taking apart an iMac that is under warranty is a big deal. The two little geniuses replaced the logic board and LCD display in their first shotgun blast to isolate the problem. I will have to check to see if they set the CPU heat sink correctly. Fans are running most of the time at 1200 rpm but do increase at times. Found an application that allows me to increase their minimum speed. I tried it for a while and it worked but then I inadvertently uninstalled it.
For the time being all setting are back to normal running two processors but I reduced Boinc CPU utilization down to 20 percent. CPU is running 45 to 50 degrees C. Heat sink about 44 degrees C.
Power supply about 67C.
I think I will stay here for a while until I get some answers..
Edit: Does anybody have any figures on CPU wattage and Temp relationship
There are some who can live without wild things and some who cannot. - Aldo Leopold
Found it.. I don't know but I
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Found it.. I don't know but I think I can see problems with this..
Intel Thermal Management
Intel® also developed a motherboard-based fan speed control starting with Intel® 965 chipset-based motherboards called Intel® Quiet System Technology (Intel® QST). This new technology uses a PID (Program Integral Derivative) controller that can measure the rate of change of the processor temperature, thus predicting when the processor will reach its maximum temperature. If implemented correctly by the motherboard manufacturer, the control algorithm will operate the processor fan at minimum speed under most operating conditions. Since Intel® QST can predict when the processor will reach its maximum temperature, it will delay increasing the fan speed until just the right moment in order to keep the processor from exceeding its maximum temperature. Consult with your motherboard manufacturer to see which motherboards they offer with support for Intel® QST.
Edit: On this computer I noticed when temps were at 90C the fan was turning at min speed of 1200 RPMs
There are some who can live without wild things and some who cannot. - Aldo Leopold
Looking at the forums...
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Looking at the forums... iMacs have noted thermal problems... So much for well designed products.. SOB
I am looking into the future and I see a company circling the drain.. I am looking forward to Google's model
There are some who can live without wild things and some who cannot. - Aldo Leopold
There is something definitely
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There is something definitely wrong.. Processor Thermal Design Power is 65 Watts operating at 74.1 C..
Depending how accurate iStat is.. I am getting spikes of 70C at 25 Watts..
Looking at that again with intel thermal management that does not mean anything
There are some who can live without wild things and some who cannot. - Aldo Leopold
Downloaded A Fan Control
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Downloaded A Fan Control program SMC Fan control to control minimum fan speed. Increased CPU utilization to 50 percent. Running between 50 and 60 C. Power at about 10 W Fan running at 1300 RPM I think the fan control firmware on the Logic board was corrupt. We will keep it here for a while..
Edit: Really to look at this thing I would need a designed load
There are some who can live without wild things and some who cannot. - Aldo Leopold