Acceptable CPU temperature?

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sktn77a · #1 Post by **sktn77a** » Mon Aug 06, 2007 4:36 pm

I have a T41 (1.6GHz, 40Gb HDD, 1Gb RAM, ATI 7500) which I recently upgraded to a 2.0 GHz Dothan. When running Spybot Search and Destroy (which is pretty CPU intensive), the processor speed ramps up to 2GHz/100% CPU utilization. CPU temp increases from about 35oC (at 600MHz) to 75oC (at 2.0GHz). This seems a bit high to me. What do others think?

Oraklini · #2 Post by **Oraklini** » Mon Aug 06, 2007 5:16 pm

I installed a 2 Ghz dothan 3 weeks ago.
Running spybot right now I'm showing a max of 65oC at 2Ghz.

sktn77a · #3 Post by **sktn77a** » Mon Aug 06, 2007 7:14 pm

Thanks Oraklini. I tried SSD on a Toshiba laptop with a 2.4 GHz clelron - 85oC! With My T42/1.7Ghz/1Gb/9600/100Gb 7200rpm, it was 65oC. The T42 has the long fan for the CPU plus the 9600 while the T41 has the short fan for the CPU only.

Anybody else out there with any numbers?

goofyGAguy · #4 Post by **goofyGAguy** » Mon Aug 06, 2007 8:30 pm

More numbers here. Hope you guys don't mind a lowly T2x owner chiming in. My T23 idles in the low 40's. When running a virus or spyware scan, I've seen temps as high as 87.

ccotenj · #5 Post by **ccotenj** » Mon Aug 06, 2007 9:06 pm

t40 here (1.5 banias)...

idle right around 45... running spybot maxes out at 64 nd then bounces between 61 and 64... sitting on top of my ilap...

by chance, i have a 1.8 dothan that i hope to install tomorrow... we'll see what the difference is...

sktn77a · #6 Post by **sktn77a** » Tue Aug 07, 2007 1:18 pm

Just ran Spybot on my X31 (1.7GHz). Same as the T41 - 75oC under full load. I guess the T41 isn't totally out of whack, then. Interesting that the CPU is set to start throttling back at 80oC (not much headroom here) and to switch off completely at 95oC.

Pascal_TTH · #7 Post by **Pascal_TTH** » Tue Aug 07, 2007 2:29 pm

You can remove the fan assembly, clean the thermal grease and use Arctic Silver V. This can reduce the CPU temp for about 3°C to 5°C.

ccotenj · #8 Post by **ccotenj** » Tue Aug 07, 2007 3:11 pm

with the 1.8 dothan... idles mid 40's, running spybot maxes out at 60 and then fluctuates between 57 and 60...

again sitting on the ilap...

i also put in a long fan when i put in the processor, but i really don't know if that will have much of an effect, it was more of a "what the heck, might as well" type thing...

#9 Post by **Harryc** » Tue Aug 07, 2007 3:20 pm

2.0 Dothan in the machine in my sig - tops out at 69*c while running Spybot S&D. Normally idles at @ 44*c at 800MHz with speedstep enabled.

sktn77a · #10 Post by **sktn77a** » Tue Aug 07, 2007 3:59 pm

Pascal_TTH wrote:GPU and CPU can work flawless until 100°C. It's written in the datasheets from Intel, AMD, ATI and NVIDIA.

Just saw this on another thread.

Pascal_TTH · #11 Post by **Pascal_TTH** » Tue Aug 07, 2007 4:13 pm

It's written here : http://download.intel.com/design/mobile ... 922106.pdf

Chapter 5.1 (page 85) is dedicated to thermal specifications.

sktn77a · #12 Post by **sktn77a** » Wed Aug 08, 2007 9:16 pm

Another piece of data: Thinkpad T42, 1.6GHz dothan, ATI 7500/XGA, 40Gb HDD. Ran at as high as 60oC at full load (1.6GHz) with SSD. Interestingly, when it reached this temperature, it would keep backing down to 600MHz, with a proportionate reduction in temp to low-to-mid 50's. Anyone know if this is the CPU thermal management kicking in or just Spybot fluctuating in CPU requirement?

Temetka · #13 Post by **Temetka** » Wed Aug 08, 2007 11:00 pm

Your machine could be set to dynamic mode. Basically the more processing power you require the faster it goes. If your current tasks are not utilizing the CPU much then it will clock down to save power and run cooler.

sktn77a · #14 Post by **sktn77a** » Thu Aug 09, 2007 9:00 am

Yes, it was set to Dynamic mode. I just thought that SSD should be running at a pretty constant CPU requirement, hence my question about thermal regulation.

brentpresley · #15 Post by **brentpresley** » Thu Aug 09, 2007 9:02 pm

Using Folding@Home and SuperPi I routinely saw my 2.1GHz Dothan hit 90C.

And the bottom of the laptop would have caused burns on my legs if it was sitting there.

The cooling on the T4x series just isn't designed for much over a 1.8GHz Dothan. It can handle a 2.0, but that is about it.

The only way I kept the 2.1GHz from locking up on me was to undervolt the CPU using Notebook Hardware Control. And even then it got quite hot.

kyrotech · #16 Post by **kyrotech** » Mon Oct 08, 2007 1:20 am

Have used my T42 for almost 2 years now, its been fast and solid stable. Recently removed the fan assembly long, cleaned it and the cpu/gpu, applied some arctic silver. Installed NHC, and I get the following readings:

Room Temp ~25C

Idle @ 600Mhz
CPU: 47C
GPU: 51C

PRIME95 (~1hr) @ 1800Mhz
CPU: 79C
GPU: 61C

DX9 RTHDRIBL Version 1.2 (~30min) @ 1800Mhz
CPU: 88C
GPU: 89C

A little high, and maybe it has been running for 2 years this way

rbena · #17 Post by **rbena** » Mon Oct 08, 2007 4:22 am

On my T42 1.5 Banias...

idle CPU 39 and GPU 43... running Spybot maxes out at CPU 50 and GPU 45.

Note I've installed a long fan plus Arctic Silver 5, and am undervolting using NHC.

casperkid · #18 Post by **casperkid** » Mon Oct 08, 2007 5:56 am

IBM T40, short fan, applied Shin-etsu and under voltaged.
Room Temp ~27C

surf net @ 600Mhz
CPU: 36C
GPU: 40C

Spybot (~30min) @ max 1500Mhz
CPU: 60C
GPU: 48C

sktn77a · #19 Post by **sktn77a** » Mon Oct 08, 2007 11:15 am

rbena wrote:On my T42 1.5 Banias...

idle CPU 39 and GPU 43... running Spybot maxes out at CPU 50 and GPU 45.

Note I've installed a long fan plus Arctic Silver 5, and am undervolting using NHC.

Any reason you're undervolting the CPU? Temps look fine.

rbena · #20 Post by **rbena** » Mon Oct 08, 2007 3:36 pm

Without undervolting, when the ambient was higher, say 28 to 30C, the CPU / GPU temps were higher and the fan ran more often during intensive work. The bottom of the T42 also became uncomfortable if used on my lap.

Undervolting decreased the CPU temp 3C to 5C, which makes it more manageable.

When the ambient is 20-22C, undervolting allows the T42 to operate without the fan during normal work, except for the infrequent cycle. Note I use FanControl, and the lowest fan-activate temp setting is 45C. It is a very quiet, cool running unit.

agarza · #21 Post by **agarza** » Tue Oct 09, 2007 10:52 am

I'd say temperatures are pretty system dependant, for example a T42p user might get higher/lower temps than other user with the same machine.

My T42p with AS5 on CPU/GPU:
Idle: (really not using it, no programs running, etc) about 43-45C (CPU Undervolted)

Load: 62-64C (CPU undervolted) I think AS5 does not get along too well with my heatsink (I'm using a T43p model) the hot air I do not feel is coming from high volume.
If I do not undervolt the CPU it reaches about 75C

I would try maybe next year to replace AS5 with very good thermal compound and see what happens.

GPU temps decrease very rapidly after gaming.

rbena · #22 Post by **rbena** » Tue Oct 09, 2007 2:53 pm

xtr, you've done more research than most on lowering the temperature of your notebook.

My approach is to simply start with the lowest total watt CPU and GPU, install a long fan with good thermal paste, undervolt and also use FanControl.

I think the challenge becomes greater as the component watt ratings are higher. There's also the 'box' and particular cooling system used, and I prefer a smaller lightweight unit for travelling.

It's still amazing how the TP750-33Mhz ran so hot, while newer and more compact units have much better temperature control. The 'challenge' is still there for each new range of Thinkpads.

FTC · #23 Post by **FTC** » Tue Oct 09, 2007 4:30 pm

Hi,

In my experience the apparent variability of temps in different machines is more related to the installation of the heatsink and amount of contact/pressure with the processor and/or GPU than anything else. I have played with 1 banias and 3 different dothan processors (400 and 533) in 3 different T4x systems (1 T40 and 2 different T42's), and found out that I could reach *almost* the same temp w/all dothans if ran at the same speed and with the same amount of undervolt once the heatsink is in full contact with the core. As a reference I agree with xtr observations... 65oC for a full loaded dothan running at 1.8Ghz. Another thing is the banias core, which does run 10 oC hotter than dothans for the same speed.

Getting this 'full contact' is not that easy though.. it usually costs me 2-3 attempts when installing long fans to get this thing done optimally for the CPU and the GPU. For this last one (GPU, talking about the 9600) the 'optimal' load temp is 80oC.

rbena · #24 Post by **rbena** » Wed Oct 10, 2007 3:38 am

Test on my T42 - Dothan 1.8, with long fan and AS5
(Ambient was 65F or 18.3C for the test)

At FULL LOAD STRESS TEST / FAN @ 3600
-----------------------------------------
CPU (undervolted)... 53C
GPU...................... 54C

Acceptable CPU temperature?

Acceptable CPU temperature?

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