Solved bios temp / real temp

[scrooge]

hello
can someone please tell me why my bios temp is 31C. and after booting to windows 7 real temp says 42c.?
i'm using a E8400 chip and asus motherboard (p5q pro turbo) . what should the tjmax in real temp be set to i have it at 95 now .
thanks for your help
scrooge

 

[A Guy]

I believe it is because BIOS doesn't measure the core temps like Real Temp does. It measures the CPU temp. I think CPU temp will always be lower than the core temps? Also, differences in programs will do that. Intel said that Tjmax was 100, but they also said these sensors are incredibly inaccurate and get worse the further you go from Tjmax.

The RealTemp documentation outlines how you can calibrate your sensors to get more accurate idle temps.

A Guy

 

[tw33k]

My core temps are always around 10c lower than my CPU surface temp.

http://www.sevenforums.com/performa...-what-youre-cpu-system-temps.html#post1035856

 

[Bill2]

This is a somewhat hazy area but may be a intel/amd thing. On intel processors, core temps are reported higher than cpu temps while on amd's (at least certain amd's) its the reverse. Starting with the Phenoms, AMD's sensor no longer reports an absolute temperature anymore, but a reading with a certain offset, which is unknown. It is estimated that this offset is between 10 - 15c.

Also different motherboards have sensors placed somewhat differently.

 

[tw33k]

This is a somewhat hazy area but may be a intel/amd thing. On intel processors, core temps are reported higher than cpu temps while on amd's (at least certain amd's) its the reverse. Starting with the Phenoms, AMD's sensor no longer reports an absolute temperature anymore, but a reading with a certain offset, which is unknown. It is estimated that this offset is between 10 - 15c.

Also different motherboards have sensors placed somewhat differently.

That's right. For AMD CPUs, the CPU temp is taken directly from the mobo sensor. The Core temps are calculated readings based on who knows what (???)

 

[HammerHead]

High -- Low

Interesting subject. Only familiar with Intel. Core temps run about 8 -- 10 deg higher than CPU temp. I am trying to imagine why "core" temps would run lower. If the word core can be related to inside then they would run warmer as the skin is losing heat at a faster rate. I am going to have find something to read on that. I had never gave it much thought.

 

[HammerHead]

CPU Temp

After some reading on the I7 900 series. It seems to me there is only one DTS on board the chip. A single wire (Trace) and a dedicated pin for output. The signal is analog converted to digital. I guess all the core readings, etc. are "voodoo" determined by some math calc.

AMD could be reporting the distance to Tmax which would give a lower reading than skin?

 

[Pusspa]

could the reason for the difference in temperature simply be that the computer is not under any load in bios, but after booting the OS, and the background process's running, there is a now a load?

 

[LiquidSnak]

This is a somewhat hazy area but may be a intel/amd thing. On intel processors, core temps are reported higher than cpu temps while on amd's (at least certain amd's) its the reverse. Starting with the Phenoms, AMD's sensor no longer reports an absolute temperature anymore, but a reading with a certain offset, which is unknown. It is estimated that this offset is between 10 - 15c.

Also different motherboards have sensors placed somewhat differently.

Could it just be a "Phenom"enon? (I'm sorry, I could not resist)

The AMD temperature reading could read lower, as the motherboard might absorb heat, while the cores are in direct contact with the case, which offers cooling?

 

[linnemeyerhere]

From my latest Intelligence it is a Phenomenon !

 

[madtownidiot]

CPU temperature rises when you start windows. Booting windows and loading startup programs is very cpu intensive. To make it worse, some systems hand off control of the fans to the OS during boot, so the temperature sometimes spikes 30-40 degrees for a few seconds in some cases, but there's nothing to worry about.

 

[Wishmaster]

My Q9650 & a E8400 I have both show something wierd with CoreTemp at idles.
But perfectly fine once under a load.

The Quad has Core 3 stuck at 40C no matter what, when in reality its in the low-mid 30s.
The other 3 seem to be fine.

The E8400 has core 1 stuck.

It does seem that idle temps are just a rough guideline and often inaccurate.
I honestly wouldn't worry to much about them.


Since its more accurate under load:
Run Prime95 for a couple hours.
At that point, make note of what the Temps are.

If they are reasonable, I wouldnt worry about what it shows at idle as theres a very good probablity that at least 1 of the cores is not being reported properly when its idling.

 

[archie123]

could the reason for the difference in temperature simply be that the computer is not under any load in bios, but after booting the OS, and the background process's running, there is a now a load?

yes absolutely