My CPU-B Heatsink is always hotter than A. Is it normal?

I'm wondering if it's normal the constant difference between CPU-A and CPU-B heatsink degree in my Mac Pro 2,1: CPU-B is constantly hotter than A. And when B reaches 41/42° my Mac Pro re-boots itself so I have to raise the fans speed to avoid this...

those are not even high temos, barely a cause until you hit 7's, did you do cpu repkacement or redo compound on heatsink? poor contact?

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:censored:? Lapped my heatsink, now running HOTTER!

Ok, I lapped the heatsink to a nice shiny mirror finish. Looks great.
I removed most of the metal that comprises the second hard disk cage.
I also reversed the smaller fan on the heatsink. I couldn't reverse both of them due to not having the machine screws.
Now, my system is running about 2-5 degrees HOTTER than it was before I did all this? What the hell? Is it possible I didn't use enough Arctic Silver?
Matt

It might be shiny, but is it FLAT?
Or more precisely, is the surface exactly the same shape as the CPU (to atomic level)? I guess the most practical way to ensure this is to make both surfaces perfectly flat. The reason we use thermal paste is to fill in the microscopic gaps between the two metal surfaces - the trick is to use just enough to exactly fill in the gaps, without having any extra thickness. I'm told that a credit card is a good applicator! (I've also heard that toothpaste works remarkably well, until it dries out after a few minutes).
Oh, and you did run the tests at roughly the same ambient temperature, didn't you?
Cheers

CPU2 hotter than CPU1... When to worry?

G'day,
My recently acquired June04 1.8GHz dual processor PowerMac G5 has 1 CPU constantly running at least 10°C hotter than the other CPU.
I've just opened the computer up and had a look... and there are no screws holding either of the CPUs/heatsinks in place.
(I know - not good to be running the computer like that!!!)
Would this alone be a likely cause of the overheating? (Well - and - what IS overheating - at what temperature do you start to worry)
Thanks
cosmic

Hi-
75ºC is probably a good temp under load.
I don't think temps under 80ºC are much to worry about.
Variations between CPU temps are common, though usually a bit closer together.
One CPU will typically be hit with system load more than the other, so one being hotter would be normal.
Also, the upper CPU gets an extra dose from the normal physics of heat.....
However, there should be 4 screws holding the processor heat sink assembly to the board.
They are either Phillips or 2.5 mm Hex.
Check airflow, cleanliness, and check the function of fans/temp using an app like Temperature Monitor from Marcel Bresink.
iStat is another app to use.
Watch Console/Logs for any thermal runaway entries.
Might use Activity Monitor to see which CPU is getting worked.
That, or the Processor pref pane from CHUD.

Quad G5 - One processor runs 20 degreesF hotter than the other!

I use an app called Hardware Monitor to keep tabs on the various sensors in my G5. Today, for apparently no reason at all, CPU A (both cores) runs 20 degreesF hotter than CPU B!!! Not to mention 20 degreesF hotter than they ever did in the 4 months I've had the system. It does not matter if the computer is idle or if I give it a heavy work load, CPU A is always about 20 degrees hotter (it varies about 5 degrees -- for example, A is 122.3dF right now, and B is 103.0dF). I did a clean OS install on a different drive and took readings again, sure enough, it is the same. I removed all peripherals, check inside for dust, debris, etc... I can find no reason why this would happen! So far it has not been a problem, all the fans and pumps run at normal speeds. In the past my temps varied from about 98dF when idle, to about 150dF when under heavy load. CPU A now is 122dF - 165dF! Anyone have any ideas?

This is only speculation, but it may because your coolant is not flowing at peak efficiently. What could cause this? There are micro-channels the coolant flows through to cool the processors. They may be starting to clog up for some reason or another. If the processors get to hot, the unit will go into thermal shutdown, so you don't need to worry -- yet. I would keep your eye on it and if the unit shuts down while you are working on it, check your logs for lines with "thermal" in them and get the unit looked at. Your LCS may need to be replaced at that point.
Also, make sure you have/get AppleCare!
-Bmer
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Hey everyone,
I have a MBP 2.16Ghz, it's about 20 months old. About a year ago I had some problems with it and Apple replaced my battery and my motherboard. The machine was running fine without any problems. This week I realized that the MBP was becoming hotter than normal and that the fans were running a lot more frequently. Eventually the MBP shut down on me randomly while running it on an almost full battery. I then decided to reset the SMC and re-install the Intel 10.4.11 combo update. While using the MBP on a full battery, once again the fans kicked in while just surfing the web. The fans would never turn on before while surfing the web. All of a sudden the MBP just shut down on me. I really have no idea what the problem could be. Unfortunately I'm out of warranty. If anyone has any suggestions or similar issues please do post. Thanks.

Thanks a lot for your reply. I did run the Apple Hardware Test and after running both normal and extended tests no trouble was found. I managed to download the widget called iStat Pro, I realized that my CPU was idling at 50%, and the CPU temperature was 80 degrees Celsius. This caused my fans to run consistently at 6000RPM. I discovered that the random shut down while running on the battery was caused by too much current being drained by the system. So as you suggested, it was indeed happening for safety reasons.
By looking at the Activity Monitor and selecting all processes I saw that a process called printjobmgr was utilizing 100% of the CPU. I found this strange as I had performed several restarts and would have expected this process to terminate on its own. As soon as I used Force Quit, everything returned to normal. Strangely, every time I print something, the printjobmgr starts up and utilizes 100% of the CPU. This lasts until the printing is finished. I still was unable to find a permanent solution to this.

It's gonna be hotter than my metal PowerBook G4?

One thing I learned to deal with when I upgraded from my iBook G3 to my PowerBook G4 12" is that the aluminum casing did get hot..and I mean HOT! But I would say that most of the time it was just warm, even "cool" when just checking email for a short time...certainly not hot when it had just been sitting there in sleep mode connected to the AC adapter.
I was hoping returning to the plastic casing would mean not getting scorched and sweaty from a hot metal underside. If you are telling me this MacBook is WAYYYY hotter than my PowerBook, man, that sounds bad! Hopefully I will be lucky with my new MacBook.

Note:
"hot" = temperature is high enough to cause pain or at least discomfort
"warm" = not cool and maybe sweat-inducing, but no real discomfort/pain
Hi there! I have seen one MacBook so far, the black 2.0 GHz model, and it is much cooler than the PowerBook. I had a 12" PowerBook before (1.33 GHz) which, under some circumstances, got hot. When I say hot I mean pain.
Since I have had experiences with four MacBook Pros so far, two 15" and two 17", I was very interested in the heat problems. All of the MBPs are hot. If you stress them for a while, they will burn you. They will probably not cause injuries, but it sure does not feel good. However, the MacBook, as previously mentioned a 2.0 GHz machine, did not get hot at all. It did get warm – after 15 minutes of 100% CPU load it actually got very warm – but not as hot as the MBPs and not even as hot as my old PowerBook.
In conclusion: at 100% CPU load (2x100%, actually) for quite some time, you will have a very warm computer in your lap and you might feel a bit sweaty. However, it will not get hot ("HOT!") like the PowerBooks did. The MacBook does not seem to have the "hot upper left corner" either and the area above the function keys is just rather warm, instead of painfully hot.
Hope this answers your question somewhat. Even though this is a rather subjective matter, I think that I, with confidence, can assure you that the MacBook is at least not hotter than the PowerBook. I just wish that they could do something about the MacBook Pros... I am writing this with the computer in my lap and I know that if I had some background process chewing CPU for a while, it would start to hurt.
Mac OS X (10.4.6)
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Is Safari hotter than Firefox on MacBook Air 2GB?

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CPU temp of 133?
Hopefully that reading is in Fahrenheit so I'll need to change my Preferences in iStat as I normally work in Celsius
These readings are from a 2011 MBA with a 1.7GHz i5 Processor and 4GB Memory so we are not comparing appples with oranges but it will give you a ballpark figure. Software is Lion (10.7.3)
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Does anybody knows why playing h.264 video clips using Adobe
AIR designed application always worst than VLC.
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I've been working with h.264 video for quite a bit recently.
Here are some of my experiences using flash as the display
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Alright, thanks for the quick replies. The reason I want to solve this is because the fan spins way faster in Linux than Windows, and it's gotten annoying how loud it is.
The CPU frequency is the same in Linux and Windows (if not a little slower in Linux).
According to htop there's no significant workload right now.
I don't see why the graphics card would be any hotter in Linux (although I'll check that out now).
The fan is spinning way faster in Linux, so it's definitely not that Linux runs the fan slower.
Do you think it would be safe to assume lm-sensors is just over estimating the thermal junction, and I can force the fans to spin a little slower?
e: When I run sensors and get a line like this -
Core 0: +58.0°C (high = +80.0°C, crit = +90.0°C)
The crit temperature is TJunction, right?
Last edited by Yes (2011-04-10 17:19:06)

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Dear SAP Gurus,
Am working on below requirement in a support project..
Need to ensure GR posting date always greater than in PO creation date. Only current month is open for GR posting and at present as a standard system allows to post GR any date in the current open period.
Is there any way, we can control the same via messages without implementing any exits or badis.
Appreciate immediate response.
Regards,
GM

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My CPU-B Heatsink is always hotter than A. Is it normal?

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