On Jul 11, 2005, at 9:41 AM, Germain M. wrote:
Surely an old topic but new to me. Should I be concerned about the
temperature of the CPU and HD on my iMac G5/1.8 mhz? The little app
Temperature Monitor shows 145F (63C) for the CPU and 122F (50C) for
the HD, that is Word and Mail opened. At times it peaks at 160F for
the CPU and 135F for the HD. What are your numbers? I heard so
numerous rumours about defective motherboards. A fan was replaced by
Apple after noise complaining. I was told Apple wouldn't no more
change the middleplane, only the defective fan.
Germain,
I've got an iMac G5 2 GHz 20". According to the utility I've been
using for more than 145 running hours, ThermographX, the CPU usually
runs about 129 F and the hard drive runs about 127 F during web
surfing, e-mail, word processing, etc. I've seen higher and lower
"stabilized running temperatures" depending on the ambient room
temperature, which is affected by whether the window three feet from
the iMac is open or closed. (Our mean average annual temperature here
in Eureka, CA, is 53 F; yesterday we set a new July 10 record temp of
70 F.)
The hard drive starts out at ambient room temp, and slowly climbs to
125-127 F. I've occasionally seen it in the 130's, but only when
running, say, a Virex scan or other program that makes constant use
of the hard drive for a while.
The CPU temp has hit a max of 183 degrees several times, and I've
seen it in the 150's-160's often during CPU-intensive activity.
Normally, the fans are fairly quiet, but as the temp goes up they
start spinning faster and getting louder, and the temps drop pretty
quickly. However, even when the temp spiked to 183 those times, the
fans were nowhere near max speeds (such as can be obtained when
running diagnostics and such when booted from the install DVD). So
apparently Apple has built in excess cooling capacity. I don't know
if this is true of earlier G5 iMacs or not. Mine was built in late
May 2005, a few months after Apple "fixed" first-generation G5 iMac
overheat problems.
I'm a little concerned about the 183 F. spikes, but I bought the 3-
year AppleCare in anticipation that heat could be a problem with the
new design of the iMac G5. If anything's going to go in the next
three years, I'm covered.
HTH,
Jim
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