Abnormally low running temps E6850

[Jazcat]

I've just built a new system and the idle CPU running temp is showing 6c(43 fahrenheit) with a E6850. I've an ASUS P5K Premium/WiFi Mobo and I used their PC Probe II to show the running temps.
Is there a known bug with with this motherboard? There's no way the CPU temp can be lower than the ambient air temp, the motherboard temp was reading 31c and it'd be roughly 20c room temperature

It's currently being air cooled and soon i'll be water cooling it, i'd really like to see the proper temps so i can see what the hell is going on, especially when i start to O/C.

 

[bryanW1995]

my e6750 is running at 15c idle, 29c load right now according to all readings except the bios and uguru, which both show 29c. I've heard many people have this problem with the 1333fsb chips. I can't even get cpuz to show correctly!!!

 

[Shimmishim]

the temperature is measured based off of the wrong tjunction temp... so what you have to do is add about 15C's to what you see and that's your actual temp.

 

[Jazcat]

Ok i've just read on another forum to use CoreTemp to show the 2 Die sensor readings.

But other E6850 owners are also getting very low running temps so apparently this is normal. What I cannot understand is how the temps can be lower than ambient air temperature using air cooling?

 

[Slackenerny]

Originally posted by: Jazcat
Ok i've just read on another forum to use CoreTemp to show the 2 Die sensor readings.

But other E6850 owners are also getting very low running temps so apparently this is normal. What I cannot understand is how the temps can be lower than ambient air temperature using air cooling?

You can't. See explanation and adjustment in this thread here (its not just E6750s):

http://forums.anandtech.com/me...=2076349&enterthread=y

 

[bryanW1995]

slack, have you heard of any fsb holes in ip35 pro's? I couldn't get above 6x437 stable. couldn't post or even try, just a faint little blip as the fans tried to spool up then nothing. That lasts to somewhere between 451-454 since I had the same problem at 450 and it went away at 455. I'm working on getting the beta bios to fix it. I'm currently running 7x457 for a few minutes on orthos before going for 8x455. my fingers are crossed...I was at 1.47 vcore at 8x437 so this could be too much of a jump.

btw, I maxed out at 6x468, I booted windows at 470 but screen locked up while running orthos for 80 seconds. no orthos errors strangely enough. tried to go past that in case it was another fsb hole but would not post over 474.

 

[Slackenerny]

Unfortunately I'm not familiar with the ABIT boards, but I didn't hit any FSB holes on my Gigabyte board. It was fine at any multipler and\or FSB all the way to 515.

I've just checked my OC notes and I needed 1.4875 to run at 455 and your chip seems to need a bit more voltage than mine for the same level so you might need 1.5V to get that 455. Least you've got a rockin' cooler.

 

[Comdrpopnfresh]

Just use speedfan, set the correct sensor, and if need be give a proper skew adjustment (someone above listed 15 degress). I prefer to use speedfan rather than Asus's Qfan, which sucks horribly (won't even let me se a goal temp on my mobo). If the problem still doesn't go away it will most likely be remedied in the next release of bios.

 

[Comdrpopnfresh]

Just use speedfan, set the correct sensor, and if need be give a proper skew adjustment (someone above listed 15 degress). I prefer to use speedfan rather than Asus's Qfan, which sucks horribly (won't even let me se a goal temp on my mobo). If the problem still doesn't go away it will most likely be remedied in the next release of bios.

 

[SerpentRoyal]

Didn't see any FSB hole with my Abit IP35-E from 200 to 495MHz and E6320 (5 MHz increment). I suspect the Pro version should be very similar in performance. No longer have the Pro board for re-evaluation.

CPU core speed is KING. Always use the highest multiplier for best performance. Less stress on RAM, CPU, and MB. Some CPUs will exhibit erratic behaviour when you drop to multi to 6 or 7x. Not many C2D chips will achieve complete stability on air above 3.5GHz. Adding more Vcore will do nothing to raise the core speed when you're at the upper limit of the chip.

 

[Shimmishim]

i've tested my chip up to 530 mhz on the IP35 pro.... but i'm pretty sure the limit was the chip and not the board.

 

[bryanW1995]

I agree on that! I'm finally stable for 45 min at 8x438 with a 1.47 vcore. Running seti@home 100% on both cores bumps temps to 50c, assuming the standard 15c error correction. I'm going to leave it running overnight and see if I need to drop down to 3.4 or so. I couldn't get it stable over 468 and bracketed the fsb hole at 440-450. Will try installing beta bios tomorrow to see if that helps with anything.