T61 Penryn CPU Temperature

I'm trying to find out how much difference there is in Penryn (T9XXX, T8XXX) and Merom (T7XXX) CPU's temperature/heat dissipation and whether they can operate cool without fan.

Could at least someone with Penryn CPU in their T61 post their idle temperature with TPFanControl and fan off. It is better to let idle temp settle for an hour or so to be accurate.

If you do, please post all these:
-CPU idle temperature
-ambient temperature
-which CPU
-integrated or discrete GPU
-OS
-lowest voltage/vid (not necessary)

I have T61 with T7100. Idle temp is ~55C in 25C ambient at 0.85V.

If there are people who have had both CPU's, was there difference in temperature and did Penryn CPU feel cooler too?

Thanks.

 

I will get back to you tomorrow with the results. I've a T8100

 

That would be nice. Bump.

 

But to reduce tdp, Lenovo run's the later generation processors at lower speeds than they are cable of.

Renee

 

Bump.

Which later generation processors?

What kind of lower speeds? SLFM/half speeds? Merom also uses them and they don't really lower temperature unless you use higher voltage on normal speeds.
I can lower my T7100 speed down to 600MHz with SLFM.

Or some other type of speeds (sleep mode?)? Do they use lower voltage than SLFM speed or give lower temperature? If so, then I should rather ask for SLFM idle temperature or web browsing temperature.

 

"What kind of lower speeds?"

Engineering runs the current pocessors at reduced speeds and this is set by a bootfile. An example is the I7 2.9 ghz processor that is run with a max speed of 2.5 ghz.

Renee

 

I saw your thread at TPforums too, seems you got interesting data there. I havent had the time to let idle my machine, but i will when i have some time of spare.

 

I can do it with my Penryn preocessor when I get home... At work right now... But with fan running I'm getting an idle temperature of around 33-37 degrees celcius and thats when my notebook is placed on my bed or pillow...

 

Bumpity bump

 

Sorry, I forgot I will post results today...

 

is that with the fan off?

either way, seems a bit high.
Are you undervolting?, if not then here : the undervolting guide.

 

Bump .

 

I got a temperature of between 45-48 degrees celcius with fan off. Ambient temperature is around 27 degrees. Specifications can be seen in my signature...

 

Many thanks.

I still got to ask how long did you let the temperature settle? ~1 hour, many hours, or less than 1 hour. When I have measured my temps they always take many hours to really settle down...but this will be a good approximation.

 

Between 1-1½ hours... I had some work which needed to be done, so I couldn't let it settle any longer

 

Can you (or anyone else) post idle temp too? That should do it.

 

Bump .

 

I don't own a Penryn T61 but I do own a Merom T61. I have Core 2 Duo T7300 @ 2.0GHz, 4GB RAM & WD Scorpio Black 250GB 7200RPM HDD.

Idle temperature reads 41-47 degrees celcius and has been running for 7 hours in office now. Though I have opened it and put new thermal paste on before (Arctic Silver 5) which helps it marginally.

 

Do you want the idle temps when first booting the machine for the first time (in the morning) or it doesn't matter?

 

Is this with fan off altogether? If it is, do you have idea why it varies so much and why it's so low? What is the ambient temperature?

It doesn't matter. If it has been running some time already, it is probably better since the temperature will settle down faster.

Thanks.

 

Hi, yes TPFC say Fan 0 so no fan (speed 0RPM). Ambient Temperature is 34 degrees celcius on my computer. As well as TPFC (reads 43 degrees celcius) I use CoreTemp to measure the digital thermal stats which tends to give a more accurate reading on the temperature of each core which fluctuates from 41-47 though on average it would be around 43 degrees celcius. I guess the reason for the fluctuation in temperature is the services that run in the background on my T61 over time. But generally it reads 41/44 most of the time.

I don't think its that low the readings but a change in thermal paste definitely helps to cool the CPU down. Stock ones tend to dry out over time and degrade in cooling performance. I changed my thermal paste and gave the T61 a good clean about 2 months ago to keep it tip top. It requires a bit of patience but is worth it in the end. I just followed the hardware manual to carefully access the heatsink which you can find here - http://www-307.ibm.com/pc/support/site.wss/MIGR-67760.html

 

bump .

 

bump .

 

bump .

 

bump .

 

Roughly 40-41 celsius for me.

 

I have a t61 with the Penryn 2.4 (8300), integrated graphics, and an Intel SSD.

You didn't specify whether you wanted the laptop to have programs running or not. In an ambient temp of 22 I get mid-40s with the fan at the lowest setting (1 - about 2900 rpm). This is with a half-dozen programs open - Word, Firefox, my database (Commence CRM), Dragon Speech, and Foxit Reader.

With the fan off the temp rises to the 60s. I don't think I would let the thing run for an hour or so with the fan off; there's no reason to let it get that hot.

I started experimenting with TPF last weekend. The Lenovo settings give it a very wide temperature swing. The fan would come on and drive the temperature down to the mid-40s. Then the fan will switch off and the temp will rise to 60+ before coming on again. I've never seen a thermostat swing so much.

My experience seems to be different than others. My laptop is over a year old and in factory trim (no thermal paste or other mods). What's going on?

Also, it seems for my machine the best would be to set the fan for continuous running at somewhat less than the "1" setting. Is there any way to do this?

 

Thanks a lot for the answers, they are very interesting.

There seems to be a lot of variation in temperatures. Some people have very unexpectedly low idle temp. There was a person at another forum that also had same idle temp (~55C at ~25 ambient with Merom CPU) as myself.

Do you have any external ventilation that might affect the notebook temp since 34C sounds very high for ambient. I have tried Arctic Cooling MX-2 paste, but it had little to no effect compared to stock paste.

Is P8100 a 25W or 35W CPU? I didn't find any real info on this CPU. What is your ambient temperature roughly?

Doesn't even need to be idle, but without heavy tasks/programs that affect temperature much. If you post your temperature without stress on the CPU we can compare them better. Are you running the CPU with lowest speed (and speedstep)?

Unfortunately there's no way to set the fan running slower than the lowest speed ~3000RPM in T61 (or most other Thinkpads). You can't mod the fan either, at least in any practical way.

 

A 35 W CPU I believe. Maybe 25? I am not sure. It's equipped with the integrated Intel.

The temperature variations are almost non-existent after the fan was replaced. It's dead-silent as well.

 

Do you mean the ambient temperature is 25C?

Is the fan set off at this 40-41C you reported? I got confused when you said the fan was dead-silent.

Thanks.

 

Sorry about the confusion. The ambient temp should be around 25 C and the CPU stay roughly around 40C without any tweakings. Keep in mind that I only have video player, Firefox and Office open most of the time.

Fans do get dirty/loud over time. Lenovo just replaced my fan so it's dead silent again, like how it was when I first got it.

Search my thread "T61 fan problem" if you want to know more about my T61's fan.

 

I mean do you keep the fan off altogether with TPFanControl when your notebook is idle (at 40C as you said)?

 

I don't use any utility/software/tweaks as my fan has just been replaced.

 

Ok, that cleared it out. I thought your idle temp was without fan running at all, which would have been strangely low for normal CPU.

 

bump...any more Penryn temperatures (idle/light tasking without fan)?

 

bump .

 

OK percele, I did my reading on temp idling:
T8100 undervolted to 0.95V, idling (doing nothing), it reads:


Cold boot: 39C after loading all Windows stuff (At 8:40AM)
After 1hr30min idling: 47C
Fan: Turned to OFF via TPFancontrol
Multiplier: 6x SuperFLM @ 0.95V
Ambient temp: around 26C (don't know precisely this)

If you're looking for a cool Thinkpad I'd suggest to replace your T61 to a T400 with a P series (25 watt) processor, T61 were the coolest temp operating TP when they got out but I think the 10 watt CPU's delta difference in the T400 make it cooler than T61.

Hope this helps