[Big Mac]

Okay, my motive for posting this thread is my concern over my U3 heatsink reading, which averages 158F. Strangely, my fans usually remain on low even if the U3 reading crosses above 160. According to the few things I've read from others, this number seems to be high. So, if you'll join me, I'd like to see what others are seeing from their G5s. Try to give an approximate average score for each value, or if you don't have an approximate average just post what you're seeing right now from a utility like ThermographX or Hardware Monitor. And tell us the model you're reporting, including the revision (and if at all possible whether or not its a 970 or a 970fx). I'll start us off:

Model: 970 DP 2.0 Rev B
Processor Card A Ambient: 97.7F
CPU A Die: 128F
Processor Card B Ambient: 95.0F
CPU B Die: 131
U3 Memory Controller Heatsink: 158F
Logic Board Backside: 91F

Thank you!

[gururafiki]

Here is my info-
Processor Card A Ambient: 126.5F
Processor Card B Ambient: 120.2F
Memory Controller Heatsink: 164.1F
Main Logic Board Backside: 117.3

[The Placid Casual]

Dual 1.8 G5, Rev A...


CPU A: Now 71F, Min 71F - Max 95F
CPU B: Now 71F, Min 71F - Max 91F

U3 Heat sink: Now, 125F, Min 125F - Max 131F

Backside: Now 68f, Min 68F - Max 86F

[nforcer]

There is a thread over at arstechnica concerning hot G5 temps (and the dual 2.5s in particular) that might be relevant to this discussion.

94C can't be good for a CPU.

[cancerman]

I was actually looking for a list of recommended operatin temps to input into dnetc. Moreso for laptops, but any machines would be nice.

[Big Mac]

Originally posted by nforcer:
There is a thread over at arstechnica concerning hot G5 temps (and the dual 2.5s in particular) that might be relevant to this discussion.

94C can't be good for a CPU.

Thank you for the link nforcer - that's the type of material I've been looking for.

I still think my DP 2.0's U3 heatsink is a little too hot, especially considering the numbers Placid reports. Then again, gururafiki's U3 number is close to mine, but it is expected that his numbers will be higher since he's on a 2.5.

Keep those numbers coming, friends!

[rob5243]

Rev. B Dual 2.0
All Temps in farenheit

Main Logic Board Backside: 105.6
CPU A Die Temperature 115.8
Processor Card A Ambient 107.6
CPU B Die Temperature 115.0
Processor Card B Ambient 104.9
Drive Bay 83.3
SMART Disk 102.2
Memorr Controller Heatsink 147.0

[fafnir]

You cracy Americans! Can't you use Celsius like the rest of the world?

[blakespot]

Well, I am American and...

Sitting "idle," my dual G5 2.5, at "highest" setting in Energy Saver is reading:

U3 (Memory Controller): 64.3C (147.7F)
CPU A Die: 69.7C (157.5F)
CPU B Die: 68.4C (155.1F)

...when I load SETI@Home and watch it run, some of the higher swings I see are:

U3 (Memory Controller): 87.9C (190.2F)
CPU A Die: 88.2C (190.8F)
CPU B Die: 82.7C (180.9F)

CPU A is always hotter than CPU B - presumably because the cooled liquid flows through CPU A's reservoir before getting to CPU B's reservoir and making it into the radiator again.




blakespot

[d.fine]

Idle Rev B Dual 2.0 : (backing up a dvd on background ...)

Cpu 1 : 49,5�C
Cpu 2 : 41,9�C

Main logic board backside : 29,9�C
Processor Card A ambient : 34,2�C
Processor Card B ambient : 32,0�C

Drive Bay : 23,5�C

Memory Controller Heatsink : 54,6�C

Under full load cpu's can get to around 73�C, mem controller stays at 64�C or so.

[d.fine]

Originally posted by blakespot:
CPU A is always hotter than CPU B - presumably because the cooled liquid flows through CPU A's reservoir before getting to CPU B's reservoir and making it into the radiator again.
blakespot

Doesn't it make more sense the other way around ? That CPU A is hotter than B because the cooling liquid has cooled CPU B before it cools CPU A ? Strange ...

[Groovy]

Originally posted by fafnir:
You cracy Americans! Can't you use Celsius like the rest of the world?

Celsius is very poor as it is not fine grained enough. Fahrenheit is better
but kelvin is much better still.

Also may i ask when you take someone's temp to see if they are running a fever
what scale do you use? most countries even those that use Celsius do NOT
use Celsius when taking a persons temp because of the very reason I stated above.

[Groovy]

Originally posted by Big Mac:


Model: 970 DP 2.0 Rev B
Processor Card A Ambient: 97.7F
CPU A Die: 128F
Processor Card B Ambient: 95.0F
CPU B Die: 131
U3 Memory Controller Heatsink: 158F
Logic Board Backside: 91F

Thank you!

G5 2GHz both CPUs maxed out 100% with RC5-72 dnetc client which runs 24/7
(no Pause if processor temperature threshold reached either)

CPU A Die: 151�F
CPU B Die: 151�F
U3 Memory Controller Heatsink: 136�F

the temps have never gone above those temps. In fact they are ALWAYS those
temps unless I shut down dnetc in which case the CPU temps drop a lot to

Both CPUs at 2% (I shut down the dnetc client just now to get these readings)

CPU A Die: 119�F
CPU B Die: 119�F
U3 Memory Controller Heatsink: 135�F

[Big Mac]

Well I somehow missed this related thread while searching for pertinent past threads. It seems that those of us who have not had "thermal runaway" forced sleep problems are doing quite well. A poster in the previous thread suggests running the machine hard for awhile using something like the SETI client. If the machine does not have a problem, then he claims there's nothing to worry about. I'm going to search Apple's discussion boards a little later to see if I can find anything over there.

I'm not finding a great amount of information over on the Apple Discussion board, but I did find this thread over at G5 Owners Support. I just tried turning down CPU performance to Automatic, and my die temperatures dropped to the teens. My U3 is a little lower too, but not as low as others have reported.

New numbers, "Automatic" speed setting, at idle:
CPU A Die: 115F
CPU B Die: 118F
U3 Memory Controller Heatsink: 147-151F

So now my die numbers look pretty good, but my U3 is still hotter than it should be. I'm amazed that Groovy's U3 does not edge up more than one degree during full loads. My G5 running in Automatic has a U3 reading equivalent to a 2.5GHz G5 reading while on Highest. Hmmph. I know I should not be obsessing over this, but I'm expecting my baby to last over the long haul. But perhaps my U3 sensor is not that accurate, since I saw a momentary 20 degree jump while idle...

[Groovy]

Originally posted by Big Mac:

So now my die numbers look pretty good, but my U3 is still hotter than it should be. I'm amazed that Groovy's U3 does not edge up more than one degree during full loads. My G5 running in Automatic has a U3 reading equivalent to a 2.5GHz G5 reading while on Highest. Hmmph. I know I should not be obsessing over this, but I'm expecting my baby to last over the long haul. But perhaps my U3 sensor is not that accurate, since I saw a momentary 20 degree jump while idle...

well dnetc is NOT hitting ram at all. The whole thing is in L1/L2 cache.
The U3 may see higher temps if doing lots of memory read/writes but I have
never checked it at any time other than just running dnetc and nothing else.

Also the room has AC and is never above 70F

[ixavi]

Celsius is very poor as it is not fine grained enough. Fahrenheit is better
but kelvin is much better still.

Also may i ask when you take someone's temp to see if they are running a fever
what scale do you use? most countries even those that use Celsius do NOT
use Celsius when taking a persons temp because of the very reason I stated above.

I've never seen somebody using celsius and then switching to Farenheit when talking about body temp. It's very easy: Normal body temp is 36-36,5 �C. Fever starts at 37 �C. If you reach 42 �C you're almost dead.

[P]

Originally posted by Groovy:
Celsius is very poor as it is not fine grained enough. Fahrenheit is better
but kelvin is much better still.

Also may i ask when you take someone's temp to see if they are running a fever
what scale do you use? most countries even those that use Celsius do NOT
use Celsius when taking a persons temp because of the very reason I stated above.

Kelvin has the same granularity as Celsius... Anyway it's not a problem because it works just fine to use decimals if you need more granularity - as witnessed by the examples in this thread. I don't know how good the heat sensor in the G5s are, but the one in my old G3 had a granularity of 4�C - not much call for decimal granularity there. Unfortunately, my G5 iMac has been delayed due to an aircraft failure (how's my luck, eh?) but I guess I'll know from personal experience in the next week or so.

BTW, in WHICH countries exactly do people switch to Farenheit when talking about body temp? Because I've never heard of it.

[mac freak]

While I think Celsius makes more sense overall, Fahrenheit I feel is more useful for gauging the type of temperatures people encounter day to day.

In F, 100� is "f#!king hot!". In C... 38� is "f#!king hot"...? Do y'all consider 40� to be the f#!king hot threshold? 100 seems less arbitrary than 40, at least to me

Then, there's f!#king cold. I suppose this changes depending on where you like, but here near Chicago, 0� C is NOT "f#!king cold." It's "pleasantly toasty" a good 20% of the year. I'd say "f#!king cold!" starts around 10� F, but that's pretty close to 0� F...

[British accent]
- Excuse me, good sir, but how goes the ex-terior temperature?
- Why, sir, it feels to me like a definite twenty-four point three-seven degrees.
- I must disagree sir; the temperature is most certainly twenty-four point five-nine-zero-six. I lament your insensitivity.

[American accent]
- Nice day; weather's in the 70's.

I guess what bugs me the most is that, in Celsius, you can't ask "how's the weather?", get "oh, 20's" as a response and be satisfied. The 0s, 10s, 20s, 30s, 40s, all have such a huge range in Celsius as opposed to the 30s-90s in Fahrenheit... it's bothersome.

All that aside, I'm still in favor of the U.S. finding a way to finally switch over

[Groovy]

Originally posted by ixavi:
I've never seen somebody using celsius and then switching to Farenheit when talking about body temp. It's very easy: Normal body temp is 36-36,5 �C. Fever starts at 37 �C. If you reach 42 �C you're almost dead.

I have traveled all over the world and most doctors i run into say 98.6 etc...
1 degree in Fahrenheit is a lot when it comes to a high fever and why celsius
is not fine grained enough. In fact i was just in melbourne and the docs there
mostly used Fahrenheit when talking body temps and fever. What is funny i even
brought it up to one doctor and he laughed and said that is just how it is.

hey some docs in the USA might use celsius so it all evens out

[Groovy]

Originally posted by P:
Anyway it's not a problem because it works just fine to use decimals
[/B]

The whole point was NOT using decimals. Of course
if you use decimals it doesn't matter but how many average
people at home talk in decimals. Have you ever tried to get
a decimal from a simple mercury thermometer?

Good luck with that!

BTW, in WHICH countries exactly do people switch to Farenheit when talking about body temp? Because I've never heard of it. [/B]

Within the last year. Baumholder, Germany and Melbourne, Australia.

[ixavi]

While I think Celsius makes more sense overall, Fahrenheit I feel is more useful for gauging the type of temperatures people encounter day to day.

In F, 100� is "f#!king hot!". In C... 38� is "f#!king hot"...? Do y'all consider 40� to be the f#!king hot threshold? 100 seems less arbitrary than 40, at least to me

OFF-Topic: Well. 100�C is when water starts to boil at atmosferic pressure and 0�C is the freezing point, so this is less arbitrary than being "f#!king hot"

I'm from spain and once I met an english friend, we laughed a lot when talking about dick sizes because we couldn't even compare without using a calculator. hahahaha

[P]

Originally posted by Groovy:
The whole point was NOT using decimals. Of course
if you use decimals it doesn't matter but how many average
people at home talk in decimals. Have you ever tried to get
a decimal from a simple mercury thermometer?

Good luck with that!




Within the last year. Baumholder, Germany and Melbourne, Australia.

Reading half a Celsius degree would be just as easy to read as one Farenheit degree, obviously. Mercury thermometers aren't even legal to sell in Sweden anymore - for environmental reasons. Getting rid of them is also a pain, because they are considered hazardous waste. Most thermometers are digital today, and medical thermometers have been so for even longer for just those health reasons.

About the countries, I don't know about Australia but I never heard anyone from Germany do that. You don't suppose they were being friendly and translating for you?

[Big Mac]

Boy, my thread certainly got hijacked. Oh well

[reactor]

Originally posted by blakespot:
Sitting "idle," my dual G5 2.5, at "highest" setting in Energy Saver is reading:

U3 (Memory Controller): 64.3C (147.7F)
CPU A Die: 69.7C (157.5F)
CPU B Die: 68.4C (155.1F)

...when I load SETI@Home and watch it run, some of the higher swings I see are:

U3 (Memory Controller): 87.9C (190.2F)
CPU A Die: 88.2C (190.8F)
CPU B Die: 82.7C (180.9F)

My dual G5 is now rendering a Maya scene via MentalRay renderer (thus using 2 cpu's @ 100%) bussy for hours now and I get this:
___'highest' cpu speed
U3 Heat sink: Now 56C ( ~ 132F, Min 131F - Max 132F)
CPU A: Now 41C ( ~ 105F, Min 105F - Max 105F)
CPU B: Now 40C ( ~ 104F, Min 104F - Max 104F)
Backside: 41C ( ~ 105F)

You have more than twice the CPU-heat I get @ max. How come? What good is the watercooling system?
( btw I have a 'first build' -rev A??- G5 dual 2GHz/2.5Gig Ram)

[Big Mac]

Originally posted by Groovy:
well dnetc is NOT hitting ram at all. The whole thing is in L1/L2 cache.
The U3 may see higher temps if doing lots of memory read/writes but I have
never checked it at any time other than just running dnetc and nothing else.

Also the room has AC and is never above 70F

Forgot to thank you for this information. It's a cold morning here in So. Cal, and now I happily see the effect of lower external temperatures on my G5's temperature. My heatsink was as low as 127, and is hovering at 135 right now. From the posts from you and rob, I now feel much better about the subject.

Thanks again

[Groovy]

Originally posted by P:
Reading half a Celsius degree would be just as easy to read as one Farenheit degree, obviously.

well I tend to disagree for average home users who still mostly use old thermometers
(not digital) Off course it depends on the thermometer also. All mine are marked in 1
degree increments and you would be guessing on decimals.

Originally posted by P:

Mercury thermometers aren't even legal to sell in Sweden anymore - for environmental reasons. Getting rid of them is also a pain, because they are considered hazardous waste.

It doesn't have to be Mercury. Other substances that could be used.
I just mentioned that because it is old school and in most parts of the world
it is still old school and not digital. Trust me get out of Sweden and you will see
that your medical system is NOT typical. IIRC (been 9 years since I have been to
Sweden) you have a good health care system with equal access to health services for
everyone being a major goal. It is not like that in most countries. In fact here
in the USA I'm very disappointed in this countries health care system when it comes
to everyone getting equal treatment.

Originally posted by P:

Most thermometers are digital today, and medical thermometers have been so for even longer for just those health reasons.

you appear to be looking at the world through your Sweden rose colored glasses.
Next you will be saying everyone has phones in their homes. (not even close
to being true even in USA)

Originally posted by P:
About the countries, I don't know about Australia but I never heard anyone from Germany do that. You don't suppose they were being friendly and translating for you?

No translating. they were using both.

[Groovy]

Originally posted by Big Mac:
Forgot to thank you for this information. It's a cold morning here in So. Cal, and now I happily see the effect of lower external temperatures on my G5's temperature. My heatsink was as low as 127, and is hovering at 135 right now. From the posts from you and rob, I now feel much better about the subject.

Thanks again

just trying to do my part yes i guess inlet air temp should always be part
of the data. But that sensor could be off too so maybe including room temp also
is a good idea.

i think your G5 is fine and dandy. heck i have never seen my U3 heatsink
go down to 127 and my G5 has been rock solid. (knock on wood)

[P]

Originally posted by Groovy:
well I tend to disagree for average home users who still mostly use old thermometers
(not digital) Off course it depends on the thermometer also. All mine are marked in 1
degree increments and you would be guessing on decimals.



It doesn't have to be Mercury. Other substances that could be used.
I just mentioned that because it is old school and in most parts of the world
it is still old school and not digital. Trust me get out of Sweden and you will see
that your medical system is NOT typical. IIRC (been 9 years since I have been to
Sweden) you have a good health care system with equal access to health services for
everyone being a major goal. It is not like that in most countries. In fact here
in the USA I'm very disappointed in this countries health care system when it comes
to everyone getting equal treatment.




you appear to be looking at the world through your Sweden rose colored glasses.
Next you will be saying everyone has phones in their homes. (not even close
to being true even in USA)




No translating. they were using both.

I can say that a lot has happened to Swedish health care in the last decade or so. It's NOT something to be proud of anymore - essentially it means that anyone has access, but that it can take a very long time to get treatment. If you need it faster, you pay - like most other places. Company health policies are becoming common, and they never were before.

About the thermometers, I haven't been sick enough to have a doctor use a thermometer on me in almost 20 years, but I think most thermometers are digital in health care today. They're cheap, and I think the Greens got some mercury phase-out bill through as part of a budget agreement, I seem to remember something like that.

And no, not everyone has telephones at home. Some just have mobiles