Sign in with
Sign up | Sign in
Your question

what must i trust ? speedfan temp or tat, core temp ?

Last response: in Overclocking
Share
December 3, 2006 7:19:55 AM

hey all,

im running dual instance of prime 95 with a core duo 6600 at stock speed with zalman 9500... speedfan tell me cpu is at 54 degre celcius, but TAT or core temp tell me almost 10 degres lower.. what software should i trust ?
December 3, 2006 7:53:53 AM

thanks for reply :)  im planning to o/c my cpu to 3 giga thats why im starting to worry when i see the cpu over 50 degre on speedfan, at stock speed :/ 
December 3, 2006 8:24:30 AM

yep im looking at the good temp, while speedfan tell me cpu temp is 55, both core temp and tat tell me its 50 for c0 and 48 c1, i guess i ll trust core temp and tat, plus i heard some pple saying that speedfan is not accurate and tend to give extra degre.
Related resources
December 3, 2006 8:40:32 AM

ok gonna do this, thanks for the tips :) 
December 3, 2006 7:08:26 PM

Quote:
All software gets it's reading from the same chip on the motherboard. Now this chip by itself has a margin of error. The applications also have a margine of error even when configured correctly.


Incorrect.

While the BIOS, utilities shipped with motherboards, and general utilities like speedfan do read from a motherboard diode, Core Temp and TAT read from an on-die CPU diode.

This is why neither Core Temp or TAT will work with a Pentium D or Pentium 4 - the CPU does not have a temperature diode.

Ignore other temps, use TAT or Core Temp. The CPU will automatically slow down if this reaches ~85°C. In practice you don't want it higher than about 60°C at load, the lower the better.
December 3, 2006 8:03:26 PM

And remember that when you use a 9500, use the blob and smash method for thermal paste as opposed to the spread-with-a-razor-blade method, as they are slightly concave (convex, I can't remember which, it dips inward at the centre) and you'll only get paste on the outside edges.
December 3, 2006 8:13:29 PM

what is the blob and smash method ? im using a phone card to spread the paste on the cpu, it sucks i put some a bit everywhere around the socket lol, i think i putted too much paste on the cpu too, how can i be sure there is the good quantity put on the cpu ?
December 4, 2006 5:30:12 AM

From Here

Quote:
The temperature readings are very accurate as the data is collected from a Digital Thermal Sensor (or DTS) which is located in each individual processing core, near the hottest part. This sensor is digital, which means it doesn't rely on an external circuit located on the motherboard to report temperature, its value is stored in a special register in the processor so any software can access and read it. This eliminates any inaccuracy that can be caused by external motherboard circuits and sensors and then different types of programs trying to read those sensors.


The key bit being that it eliminated the inaccuracy of external motherboard circuits.

It shouldn't work on a Pentium D as they dont have this system. My e6700 runs Core Temp and TAT fine on my Asus P5W DH, but the D805 I used to have in here doesn't. According to what you are saying the e6700 working proved I have this Winbond chip, so the D805 should work too.

The whole Core Temp site states that it only works on Pentium M (NOT netburst), Yonah and Merom/Conroe/Woodcrest, and that it reads from an on CPU diode, and I believe them over you.
December 4, 2006 6:42:32 AM

Hi All,

Just finished building my own system for the first time (by myself without help). Have been reading a lot of articles and this is what I have.
c2d 6400, gb ds3, gskill 2gb-2gbpk@ddr2800, arc freezer pro 7, 3-120mm fans in nzxt apollo case.
booted right out of the box, stock everything.

Keeping with the OP,
the first thing i did was check the temp when i booted the pc and i saw 18c and then it stabilized at around 26c. after installing windows, core temp showed 34-36@stock speed.
I have now oc'ed the system to 3.2@400fsb. core temp is idling at 44-46 and tested full load with dual p95 for a couple of hours(i know will run for longer later, worried about the temp :? ); core temp is arnd 50-54. is this good/bad/ugly?
i was expecting much lower temps with the after market cooling. i have verified the thermal paste and heatsink install (clipped and sturdy).
i have heard that the temps should go down once the thermal paste hardens, right?
also, unlike the OP, my speedfan and bios are reporting much 'lower' temps; arnd 10c+ lower than core temp. have not tried the TAT yet.

still trying to find out what the expected and acceptable temp values are for my system. if anyone has any info please post 'em. it would be very useful for first timers like me.

I think for c2d and newer processors, core temp and likewise are the best since they report from the core rather than the motherboard sensor. well, i hope some of the senior members in this forum can chime in.

here are some links, for people looking to build.
http://forums.anandtech.com/messageview.aspx?catid=28&t...
http://forums.anandtech.com/messageview.cfm?catid=28&th...
http://www.dfi-street.com/forum/showthread.php?t=16446
http://www.overclockers.com/articles1378/index02.asp
http://www.gigabyte-usa.com/Support/Motherboard/HowToRe...
http://forums.pcper.com/showthread.php?t=430686&goto=ne...
http://www.neoseeker.com/Articles/Hardware/Reviews/ga-p...
http://forums.pcper.com/forumdisplay.php?f=102
http://www.tomshardware.com/2006/10/31/the_best_video_c...
http://www.neoseeker.com/Articles/Hardware/Reviews/ga-p...
http://www.atomicmpc.com.au/forums.asp?s=2&c=6&t=10706
http://forumz.tomshardware.com/hardware/Guide-Overclock...
http://www.neowin.net/forum/lofiversion/index.php/t5038...
http://forum.overclockersonline.net/index.php?t=msg&got...
December 4, 2006 4:46:40 PM

I'm getting the exact opposite. TAT is showing 51 and 50 at idle. Speed Fan is showing 32, and if I remember correctly, CoreTemp was maybe a degree higher than SpeedFan. Bios readings around that same 32-33 range, so I'm inclined to go with SpeedFan or CoreTemp.

E6300 @ 2.8 running at stock voltages.
Gigabyte S3 @ 400FSB.
G.Skill PC6400 5-5-5-15 2X512 @ 1.8V.

Wusy's guide is great! Couple of differences it seems between the DS3 and S3, but close enough to make it all work.

Couldn't find how to run Prime95 in tortue mode. Didn't see the option for it. :? That's about all I have left. Up and running smooth as silk.
December 4, 2006 5:55:39 PM

are you using stck heatsink or something else? 32-33 in core temp is nice! i wish my core temp would settle for that :?
December 4, 2006 6:29:21 PM

Stock HSF currently. Heck, even used the stock thermal pad that came with it. Will upgrade if heat becomes an issue.

I'm a little confused by the differences between TAT and CoreTemp. I could understand a couple of degrees, but not 10+. Gonna check it again tonight, and hopefully figure out this Prime95 thing so I can stress it.
December 4, 2006 7:01:35 PM

Hm yes coretemp and TAT both read from the same place, on my PC they give readings within 1°C of each other at all times.

If they arent for you thats very strange :/ 
December 4, 2006 7:13:46 PM

Quote:
TAT is showing 51 and 50 at idle. Speed Fan is showing 32, and if I remember correctly, CoreTemp was maybe a degree higher than SpeedFan. Bios readings around that same 32-33 range, so I'm inclined to go with SpeedFan or CoreTemp.


thats almost 20c diff!!

anyways,
if u have stock hsf, you are very lucky then. i cant imagine ocing that high with stock hsf. just be careful, or maybe u know what ur doing unlike me :)  .
my core temp and speedfan/bios differ by approx 8-10c. speedfan and easytune (bios) are almost the same +/-1!!
any idea on whats the expected and acceptable levels?
December 4, 2006 7:55:02 PM

Quote:
And remember that when you use a 9500, use the blob and smash method for thermal paste as opposed to the spread-with-a-razor-blade method, as they are slightly concave (convex, I can't remember which, it dips inward at the centre) and you'll only get paste on the outside edges.


Maybe on yours, but mine was perfectly flat and polished to a mirror finish. It's so flat you could probably get away with no thermal compound if your cpu was just as flat.

If it that far out of spec I would sand it flat, as your blob and smash method would be highly inefficient.
December 4, 2006 11:16:59 PM

mpilch,
If I am not mistaken, athlon is compatible with the core temp program. though i have read a lot about people not trusting it. on the other hand all c2d users are very confident about coretemp. :? :? :?

Anyways, Here is my question again;
what are the expected and acceptable temperatures (bot coretemp and bios) for my setup or a c2d6400 oced and not oced.

Here is what the author had to say about his coretemp program.
http://www.overclockers.com/articles1378/index02.asp
Quote:

Core Temp lets you see the temperature of each core in every CPU in your system in real time, as long as it's a K8 (Athlon64, Sempron, Opteron) CPU or Yonah/Conroe based (Core Duo, Core 2 Duo, XEON). You get a simple, clean interface which shows you the processor, Tjunction/TCaseMax and the temperatures.
December 5, 2006 1:08:09 AM

Quote:
Hm yes coretemp and TAT both read from the same place, on my PC they give readings within 1°C of each other at all times.

If they arent for you thats very strange :/ 


I had it backwards. CoreTemp and TAT are identical. Running right at 60 under full load. SpeedFan is reading 47 tops. Speedfan sems ot be more in line with bios temp reading on boot. Really not sure what to think at this point.

Should be safe at 60, but I'd rather it be a touch cooler. May look into an aftermarket HSF afterall.
!