cpu/core temps WAY off

Hey guys,

I've been having a problem with my notebook since I bought it in September. Basically as the jpg attached to this thread shows, the CPU temp is WAY above the core temps, with the nice little trick that the fan of course spins quite quickly, noisily, heavily and... well, never stops as the CPU temp never drops :heink: ... not even after a whole night.

Now a few things:

-Running vista 64, had the same problem on 32.
-Notebook is on a laptop cooling pad, no airflow problems.
-Furthering that, yes, vents are dust-free.
-Every driver and whatever else up to date.
-Using power plans does not help. I'm using a "normal "one when playing games and a low cpu / gpu one when doing whatever else, yet the CPU temp as shown will just... not drop. Not ever, not even after a whole night, tried it. It stays "stuck".
-Speedfan and the like do nothing, this is an Acer notebook and no third party software can adjust the fan speed.
-I do have the acer epower thing, no fan controls in there. Nothing that can help actually.
-have I forgotten anything? possibly, will edit as suggestions (hopefully) come up.
-Ah yes, bios is up to date.

Basic idea is I've literally ran out of hope to solve this. I've tried anything and everything I may know about this problem and ... I need help!
Just in case it's still not clear, here is exactly what happens:

Fan / notebook temps will all be fine when doing anything but 3D intensive stuff. Play a game for a while and temp rises, fan spins up. Quite normal, yep.
Stop playing, leave the laptop on for a whole night, even put the "low cpu / gpu" power plan on... Temp of the CPU will remain at +70° , core ones will be around 35. Fan will have been on at full speed all night (very noisy, too).

Only way to get around this is to turn off the laptop, then on again. Not very practical.

Please, anyone, ideas? Is something wrong with vista / the hardware, or am I missing something?

Notebook:

Acer aspire 5920G
Core 2 Duo T5750 @ 2Ghz
4 GB DDR2
ATI Radeon HD 3650

 

Acer Gemstone BIOSs are screwed up and have issues accessing the CPU DTS.

If possible, run Orthos (Small-FFTs) for a couple of minutes and upload a screenshot of HWMonitor.

 

aaah, thanks for the reply! Didn't know that about the screwed up bios.. :/
Did you mean Orthos as in Orthos Stress Prime? Just googled it, i'm assuming that's the one?

 

Here is Orthos and HWMonitor.

 

At least your actual temps will be superlow

 

My guess is that the 72C reading on the CPU is a mistake and that the fan is running full time because it thinks 72C is too high. It seems unlikely that a Core 2 CPU would be that hot when sitting idle and the fan running 100%, thus my guess. There has to be a bad temp sensor somewhere or the CPU is misreporting its temp to the BIOS or the BIOS is confused about the actual temp. I suspect the Core readings of 37C are actually the correct temp. Maybe the BIOS is thinking that the CPU temp is the combined temp of the 2 cores, which is a mistake.

 

orthos thingy is attached to this post.

yeah i'm assuming it's a mistake, wish I could solve it though... I'm not worried about the temp really, it's just the fan going 100% forever every time i use 3D stuff is VERY annoying...

 

Well, the fan algorithm is based upon the THRM temps, so that is what needs to be controlled.

Try undervolting and see if that helps reduce the temps and the fan rpm.

 

hmm undervolting? i'm not quite sure how to do that on a notebook, this one came with a "for babies" bios: no options to change anything whatsoever.

Is it possible to do it via software in windows?

Edit: cheers will try that sometime tomorrow if I have time, will let you know if it does anything.

 

Yeah, checkout the Undervolting Guide.

 

Man! Thank you SO MUCH! took me some time over two days but I managed to lower to my max stable which is 1.013V compared to the default 1.250!
Just stressed it for 4 hrs, all stable and the cpu doesn't go over 53C! You guys are legends

Fan problem taken care of too for some reason, spins up but actually goes back down now!! YAY!

ah yes one question, will it interfere with RM clock's settings if I keep using my low gpu / cpu settings in vista? the power plans?

 

It might depend, your best bet is to go into RMClock, go to the monitoring tab and look to see what the actual multipliers and voltages are outputting. Look to see that the multipliers are going up and down in response to workload, and make sure the voltages correspond to what you set them as for each multiplier, as opposed to the original stock voltages.

 

err that sounds painful as in I can't quite be bothered But i guess I solved that question, I'm just using the RMclock power plan that came with the soft, it's all fine really

Cheers so much for the answers guys, you're the best!

 

Edit: hmm after a couple of days using the comp, the fan problem is still here... It seems whenever temps reach 60C (I found while playing games the cpu goes up to 65C max), the ACPI therm temp goes into some kind of weird overdrive mode and... while the core temps will come down afterwards but the ACPI/CPU one will stay at 60+ and fan will still keep .... spinning hard....... aah!

:' '(

 

Up! Found the solution, for whoever's interested

Very simple but had to think of it and went through about 5 months of trial-and-error: first I had to downgrade the bios to the 3808 version. (can be found here http://support.acer-euro.com/drivers/notebook/as_5920.html)

Then, having installed RMclock as suggested on this thread and undervolted to the minimum possible, I just had to go to the "advanced CPU settings" tab, and in the processor bit uncheck both "Enable Thermal monitor 1" and "Sync. TM1 on CPU cores" as well as check "Enable Enh. Halt (C1E)" ; "Enable Enh Stop Grant (C2E)" and "Enable Enh. Deep Sleep (C3E)".

Tada, tried it for two whole days. Fan spins up but this time actually, truly, finally just settles back down and shuts up for good once you stop CPU intensive stuff. No noise at last!

This solution may interest Gilo as he reported having the same problem:
http://forum.notebookreview.com/showthread.php?t=202207
(with latest bios you get the fan spinning hard after the CPU hits 63°C, with other versions of the bios you get the short bursts once it hits 63°C)

All the best!
chris