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Author Topic: CPU Temp : 255° C  (Read 16859 times)

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exileLykTopic starter

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CPU Temp : 255° C
« on: 27-October-12, 06:22:37 »

Hello,

I have seen similar topics about this bug/problem but I don't know if it's motherboard's or processor's fault.

So, my specs : AMD FX-8120, MSI 990FXA-GD65, 8Gb DDR3

When I bought the motherboard, I put the latest BIOS version (19.8) and I experienced these temps only when I had unplugged the PSU cable before starting up the computer.

With the most recent BIOS (19.9), everytime I turn on the computer (2 hours from the last switch off) I see these temps :

.

Notice that 255° C is min/max CORE temp, CPU/MB temps are normal.

If I stess the system (100% CPU activity) it won' t go over 1400MHz :



And of course the stress program fails with these CORE temps :



After I simply restart the computer, all go back to normal, it idles and stresses without problems and temps are fine.

So, 255° C CORE temp everytime system boots (with lBIOS 19.9), CPU can't go over minimum frequency but CPU/MB temps are fine. And after a restart all go back to normal.

Is it CPU or Motherboard?

Thank you for your time,

Lykourgos
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xmad

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Re: CPU Temp : 255° C
« Reply #1 on: 27-October-12, 06:57:41 »

That is usually a symptom of overheating vrms. Well a protection built into the bios anyway, but I don't think the platform you are using should be experiance this under normal operations. Try taking the door off the computer and blowing a fan at the motherboard and see if the problem goes away. If it does, you have an airflow issue.
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Re: CPU Temp : 255° C
« Reply #2 on: 27-October-12, 07:02:33 »

Just noticed:
Quote
With the most recent BIOS (19.9),


Did this happen before or did it start with the bios upgrade?
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flobelix

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Re: CPU Temp : 255° C
« Reply #3 on: 27-October-12, 08:07:38 »

From a bit of googling it turned out this is a common issue with FX cpus and is caused by the cpu sensor which is just sending a 1 binary signal so a continued signal. 255 is a byte of 1 (255 = 2^8-1).

This is caused by a defective sensor or misreading. Try deactivating TurboCore if active as some say it could be a reason for misreadings.

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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #4 on: 27-October-12, 09:01:26 »

That is usually a symptom of overheating vrms. Well a protection built into the bios anyway, but I don't think the platform you are using should be experiance this under normal operations. Try taking the door off the computer and blowing a fan at the motherboard and see if the problem goes away. If it does, you have an airflow issue.

I think I have good airflow in my case with 3X120mm and 2X140mm chassis fans, so I don't think It's because of that.. And that motherboard has heatsinks to keep temps down.

Just noticed:

Did this happen before or did it start with the bios upgrade?

It happened before only when I had previous unplugged the power cable and then turn on the PC. Now it does it at almost every startup!

From a bit of googling it turned out this is a common issue with FX cpus and is caused by the cpu sensor which is just sending a 1 binary signal so a continued signal. 255 is a byte of 1 (255 = 2^8-1).

This is caused by a defective sensor or misreading. Try deactivating TurboCore if active as some say it could be a reason for misreadings.

Turbo Core is disabled!

What can I do? I don' t like restarting my computer everytime after I switch it on..
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flobelix

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Re: CPU Temp : 255° C
« Reply #5 on: 27-October-12, 09:06:43 »

Either board's bios is buggy and not correctly reading out sensor which is unlikely when another version read the same or the cpu's sensor is faulty. Try reseating the cpu and see if that helps.
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flobelix

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Re: CPU Temp : 255° C
« Reply #6 on: 27-October-12, 09:09:23 »

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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #7 on: 27-October-12, 09:14:55 »

Ok, I will try older BIOS too..

But if there was a motherboard's sensor issue, wouldn't the CPU temp be wrong too? Because even when CORE temps are 255° C, CPU temp is shown correctly!
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flobelix

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Re: CPU Temp : 255° C
« Reply #8 on: 27-October-12, 09:17:12 »

A faulty cpu sensor is more likely indeed but trying a different bios is worth a shot.
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Re: CPU Temp : 255° C
« Reply #9 on: 27-October-12, 12:28:21 »

I don't think a fault sensor would be affected so dramtically by a bios flash. I believe there is a more recent bios than the one you have installed. I can also check for a beta bios next.
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flobelix

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Re: CPU Temp : 255° C
« Reply #10 on: 27-October-12, 12:45:41 »

Not the bios affected that, the sensor has been faulty eversince.
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #11 on: 27-October-12, 13:07:49 »

So, can I ask for CPU replacement?
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flobelix

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Re: CPU Temp : 255° C
« Reply #12 on: 27-October-12, 13:38:29 »

You can try reporting your issue.
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #13 on: 28-October-12, 03:00:44 »

Hello again,

I posted the thread to AMD community forums too and waiting for an answer..

I don't think a fault sensor would be affected so dramtically by a bios flash. I believe there is a more recent bios than the one you have installed. I can also check for a beta bios next.

The most recent BIOS is 19.9 which I had till yesterday. 19.8 was previous tested too and now I flashed 19.7 as "flobelix" recommended!
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flobelix

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Re: CPU Temp : 255° C
« Reply #14 on: 28-October-12, 05:30:16 »

I didn't see any more recent bios (which would be a beta then).
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #15 on: 29-October-12, 02:46:48 »

BIOS 19.7 didn't work : (
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flobelix

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Re: CPU Temp : 255° C
« Reply #16 on: 29-October-12, 12:14:50 »

Too bad. guess it's the Cpu's sensor then.
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Re: CPU Temp : 255° C
« Reply #17 on: 29-October-12, 14:03:14 »

You do realize that if it truly were 255ºC your board would melt and be on fire.
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #18 on: 29-October-12, 18:32:09 »

Of course Mike, I knew from the beggining that is a sensor problem BUT not from which, CPU or motherboard.

Besides that, I mentioned that CPU temp seems fine.
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Re: CPU Temp : 255° C
« Reply #19 on: 30-October-12, 12:27:22 »

Put your CPU in a board of a friend and see if it reports the same weird values.
If it doesn't it's the board, if it does it's the CPU.

My money is on a bad CPU.
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #20 on: 02-November-12, 08:37:47 »

Hello again! So, I returned CPU+Motherboard at the shop where I bougth them and after 3 days of testing they replaced my Motherboard.

They noticed unusual temps and random restarts

First boot seems normal, updated BIOS to latest official and waiting to see how it goes.
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Re: CPU Temp : 255° C
« Reply #21 on: 02-November-12, 08:40:25 »

Then it must have been a bad socket, as the sensor itself is in the CPU.

Glad to hear you got is sorted :biggthumbsup:
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #22 on: 06-November-12, 10:39:45 »

Till now all temps seem ok..

CPU is OCed to where it was and still no problems! ; )
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #23 on: 10-November-12, 08:39:04 »

And now I'm experiencing another issue.. Should I make new thread?

Everytime the computer "wake up" from standby mode, the frequency stucks at 3400MHz with much more Vcore (from 1.30V it's 1.40V). It's like Cool&Quiet and C1E don't work to drop the frequency to 1400MHz as usual and can't reach max frequency (4000MHz). After a restart everything comes back to normal..

New mainboard 990FXA-GD65, latest BIOS 19.9
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Re: CPU Temp : 255° C
« Reply #24 on: 10-November-12, 09:55:02 »

tell about it to msi at >>How to contact MSI.<<
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #25 on: 12-November-12, 06:29:18 »

I registered my product at https://register.msi.com/ but when I try to submit my problem it does nothing. I press "Submit" at the bottom of the page and it sends me to the top of the same page, like when pressing "Home" at keyboard (tried both Chrome and IE).
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #26 on: 12-November-12, 17:43:06 »

Any help? I even can't submit my problem at "My Support"!
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Re: CPU Temp : 255° C
« Reply #27 on: 12-November-12, 19:01:11 »

In which country are you located?
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Re: CPU Temp : 255° C
« Reply #28 on: 13-November-12, 05:22:12 »

Greece!
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Re: CPU Temp : 255° C
« Reply #29 on: 16-November-12, 10:30:46 »

I have the same problem with FX 4100 "CPU Temp 255° C"
I sent motherboard to msi technical service.but they told me " there is no problem in your motherboard"
motherboard's bios version is HA...

I will not chose msi again

sorry for my bad english.
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Re: CPU Temp : 255° C
« Reply #30 on: 16-November-12, 10:38:00 »

Was this only during stress testing?
With what board?
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flobelix

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Re: CPU Temp : 255° C
« Reply #31 on: 16-November-12, 10:44:56 »

lubnatsi, if you want to start bashing MSi this is not the right right place. Either you are seeking assistance and follow >>Posting Guide<< or you just want to complain and we can stop right here. You made a real bad first impression by posting "I will not chose msi again". Please stop the ranting and decide what you are up to in this forum. 
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Re: CPU Temp : 255° C
« Reply #32 on: 16-November-12, 10:47:45 »

760 gm p23
this was during playing games.
it going to be 255 degree when I play games (battlefield 3,driver san francisco,assasin creed)
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Re: CPU Temp : 255° C
« Reply #33 on: 16-November-12, 10:54:31 »

Does it also throttle when you see this?

Also, is there any overclock applied or anything? Throttling + 255 ususally indicates the bios is trying to save the mosfets from being overloaded. We usually se this in boards like yours with 125 watt cpus.
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lubnatsi

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Re: CPU Temp : 255° C
« Reply #34 on: 16-November-12, 11:02:58 »

I can t play games when i see 255 degree,it freezing

and there is no o.c or anything.
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xmad

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Re: CPU Temp : 255° C
« Reply #35 on: 16-November-12, 11:06:40 »

Perhaps the Mainboard is overheating due to lack of airflow which is kicking in the safety. Try taking the side door off the computer and blowing a fan at the board.

Also, there is a new bios out: http://www.msi.com/product/mb/760GM-P23--FX-.html#/?div=BIOS
>>Use the MSI HQ Forum USB flasher<<

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Make sure to select a "best" answer once your issue has been resolved!
Mainboard: X79A-GD65 (8D)
CPU: I7-3930K
Setting: 4.5Ghz enhanced turbo w/ speed step functioning.
Memory: Corsair Dominator 2133 CL:9  1.5v 4x4gb
Setting: 2400 CL:10
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lubnatsi

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Re: CPU Temp : 255° C
« Reply #36 on: 16-November-12, 11:14:59 »

Ok Thank you...

I will try it when motherboard come back from msi technical servise...
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exileLykTopic starter

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Re: CPU Temp : 255° C
« Reply #37 on: 16-November-12, 19:18:38 »

I finally sent my report at https://register.msi.com/ three days ago but still no answer! : (
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flobelix

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Re: CPU Temp : 255° C
« Reply #38 on: 17-November-12, 04:16:06 »

As they have to check it don't expect an answer at once. It's global support and you aren't the only one asking or reporting anything.
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MSI X299 Gaming M7 ACK (MS-7A90) Bios 1.A0
Core i7 7820X @ 4404.45 MHz (44 * 100.1 MHz, fixed all cores), 1.158v - delidded and using der8auer Skylake-X Direct Die Frame
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iamyyc

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Re: CPU Temp : 255° C
« Reply #39 on: 08-February-13, 03:43:10 »

I've been experiencing  the same problem like exileLyk. The seller changed another mb for me and it appear the same problem after upgrade bios to 19.9.  Can anybody tell me that if the cause is the mainboard or the cpu or the bios bug or hardware bug?
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The CPU Whisperer

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Re: CPU Temp : 255° C
« Reply #40 on: 08-February-13, 03:52:18 »

In Germany they only support 95W CPUs on this model:
http://de.msi.com/product/mb/760GM-P23--FX-.html

Could have something to do with it.
Looks like the 255°C is a security measure. When the power draw get's to high the bios makes the system believe the CPU is overheating and clock it down to 1440 MHz.
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flobelix

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Re: CPU Temp : 255° C
« Reply #41 on: 08-February-13, 08:51:30 »

For 760GM boards this is indeed a security feature for these not supporting 125W cpus (although listed on global and some local subsites) and to keep them alive. But original thread and iamyyc (as talking of bios 19.9) is refering to high-end 990FXA-GD65. That's the problem with the various hijacks on this thread as nobody knows of what board somone newly joining in is talking of.

255°C could on other boards also be a bad sensor or bad reaout issue but hard to tell.

iamyyc, if it just happens with the new bios version use an older one that did not feature that problem and wait for a newer version. If you need more advice open an own thread following >>Posting Guide<<
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MSI X299 Gaming M7 ACK (MS-7A90) Bios 1.A0
Core i7 7820X @ 4404.45 MHz (44 * 100.1 MHz, fixed all cores), 1.158v - delidded and using der8auer Skylake-X Direct Die Frame
Corsair H110 Liquid CPU Cooler
32GB (4 x 8GB) Corsair CMR32GX4M4Z3200C16 @ 1602.9 MHz (DDR4-3206), 16-18-18-36-2t, 1.35v
MSI GeForce RTX 2080 Ti DUKE 11G OC
1TB Crucial MX500 M.2 SSD + 2TB Crucial MX500 SSD
Thermaltake Toughpower Grand RGB 1200W Platinum • +12V: 100A • +3.3V: 25A • +5V: 25A
Windows 10 Pro
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iamyyc

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Re: CPU Temp : 255° C
« Reply #42 on: 11-February-13, 09:32:38 »

For 760GM boards this is indeed a security feature for these not supporting 125W cpus (although listed on global and some local subsites) and to keep them alive. But original thread and iamyyc (as talking of bios 19.9) is refering to high-end 990FXA-GD65. That's the problem with the various hijacks on this thread as nobody knows of what board somone newly joining in is talking of.

255°C could on other boards also be a bad sensor or bad reaout issue but hard to tell.

iamyyc, if it just happens with the new bios version use an older one that did not feature that problem and wait for a newer version. If you need more advice open an own thread following >>Posting Guide<<

i just bought a fx 8320 and 19.9 is the only version support that. sigh :undecided:
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The CPU Whisperer

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Re: CPU Temp : 255° C
« Reply #43 on: 11-February-13, 12:20:23 »

That's a 125W CPU: http://products.amd.com/en-us/DesktopCPUDetail.aspx?id=810

Wouldn't pin that one to a 760GM board unless you want your high end CPU to be stuck at 1440 MHz every other reboot.
Better get a 970 or better.
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tman45005

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Re: CPU Temp : 255° C
« Reply #44 on: 11-November-15, 03:29:33 »

Hey Guys

So I've had the same problem as above, and I've tried so many things to stop it.
I have an FX 4100 with an MSI 880GMA e35-FX (low end board)

My readings jump to 255 degrees while gaming and during stress tests, thereafter my CPU automatically underclocks to 1.6 Ghz (from 3.6), and it causes a lot of stutter in game. I used and Android app to monitor my CPU while gaming, and saw it jump from 41 degrees to 255 after a few min gaming. 
I'm using a Corsair H60 closed loop CPU water cooler, and I'm certain its far from overheating.

All I want is a way to disable the automatic underclocking, to get a better gaming experience. I've disabled all the settings related to CPU speed I could find in the BIOS but couldn't get it to stay at 3.6 Ghz.
Does anyone have any ideas?

Thanks
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Nichrome

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Re: CPU Temp : 255° C
« Reply #45 on: 11-November-15, 04:19:33 »

Please open new topic instead of resurrecting 2+ year old one! >>Please read and comply with the Forum Rules.<<
Also make sure to provide system specification. Read and follow >>Posting Guide<<


:nichlock:
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