CPU Temps

[SRB442]

Hi,
This is my first post in this forum. I have just built my first pc from scratch. I have a asus P4T-E with 1.8 P4 and when I boot the computer cold and check the cpu temp in the bios it reads around 27-30C and after completing the boot to windows XP less than a minute the asus probe reads 50-52C. I would like to find out why such a difference? I also received a Digital Doc 5 and would like to know where to place sensor for cpu temp. Thanks in advance. Steve

[Ohgr]

My guess is its windows XP causing the heat rise. Someone here will be of better help though :)

[windyridge]

you may be able to put the sensor in between the hsf and the cpu next to the core.

[The Doors]

Hi SRB442, welcome to the Forum,
Generally, Asus's Mobo are known for wrong temps reported, so considering that you have a really cool DigiDoc5, you have to insert one of the thermal sensor inbetween the Cpu Core & the HeatSink to get a true temp. What kind of Cpu Cooler & thermal paste are you using now?

[SRB442]

Wow!! Thanks for the replys already. I am new to a lot of this but this was a boxed cpu and it came with a heatsink and fan that is what I used. There was no thermal paste but there was suppose to be somthing on the heat sink. I still don't understand where to put the sensor? You wouldn't put it between the heatsink and cpu? Also does the Bios get there reading from a different sensor than the asusprobe software. Sorry for all the questions. Steve

P.S. is there a way to log out of this forum or are you logged in when you enter the forum.

[The Doors]

Yes, you have to put the thermal sensor inbetween the Cpu & the heatSink for a very accurated temps readings, but in your case not, coz the HeatSink is fixed to the Cpu Core with some kind of crappy Intel glue!

About the Log in/out, is automatic if you have choosed to use cookie ;)

[rogerdugans]

Don't know the digidoc, never had one. They do look cool though.

On the startup temps: they will take a big jump as the pc starts up, but 50c is a bit high for me: may be the Asus board. If the computer is stable you should be ok......BUT oem heatsinks aren't too good, and the thermal tape on them is junk! The combination might be why temps get so high so quick!

Get yourself some AS2 and a better hsf and you should be able to drop to low 40s or so.

[SRB442]

Thanks for all the great replys but I am still confused on this. I still don't understand why the bios cpu temp is always a lot lower than the asusprobe software. Even after running a while and restarting the temp is 20c cooler in the bios than after booting to XP. Do the bios and asusprobe use the same sensor? Does XP really make the cpu work that hard to raise temp that fast? I still don't know where to place the probe to get a good cpu temp. Sorry for the reduntant questions. Steve

[The Doors]

They read for sure the same sensor, so can be a prob of the program Asus Probe, try using MotherBoardMonitor, the best!, that you can found here (http://mbm.livewiredev.com/).
About the thermal sensor well, you must insert one of the FLAT thermal sensor of DigiDoc5 in between the Cpu cooler & the Cpu Core (the silver part in the middle of your P4), or better drill an hole into the Cpu Cooler to fit one of the ROUND thermal sensor in contact with the Cpu core.
Now the prob is that you've a P4 boxed (with Intel HeatSink on it) and to remove this kind of cooler, you need to unmount the Cpu from the Mobo, put it into an amagnetic bag, and put the bag into the freezer for 10 minutes, no more!, so you will very carefully, twist the HeatSink on the Cpu, and it will take off, so wait untill all the condensation is gone before you remount the Cpu, coz can kill your Mobo and/or Cpu!!!

Note: Removing the HeatSink from your P4 can be very dangerous, and for sure you will loose the 3 year warranty, but onestly if all will go in the wrong way, you can remount the HS using two little point of superglue in the corner of the Cpu and contact Intel for a RMA :)

P.S. let me a favour, wait for other point of wiev, coz I'm not very experienced on P4, even if probably other guys & gals will confirm you that I'm right.

[AntmanMike]

no pentium 4 heatsink is glued. they do, however, have an ihs, but only extreme oc'rs remove those, like myself. also, on p4's, you need thermal paste.

[SRB442]

I am going to guess that the bios temp is accurate and the asusprobe is wrong for now. I have 2 80mm intake fans and a 120mm and a 92mm exhaust fans plus a cpu fan and fan on the video card so there should be enough airflow. I don't worry about overheating yet. Still got to mount that sensor for cpu temp for the digital doc 5. I will have to open the box and look at what I got. Steve

[BigBlockk]

You need to go to the "Heatsink reviews and tips" page and look at Joe's rightup on how to get the best temp readings that you can get. It is called "Measure heatsink tempratures". Then it would be a good idea for you to read all the rest of the articles. If you want to know how heatsinks work, this is how to find out.

BigBlockk

Later.....

[dreadlord79]

One more thing for you to consider is the fact that it is best to have the air coming into the system to either be the same or to have more coming in to the case than to have going out. The reason for this is if you have even air flow, it takes the hot air away, right away. If you have more air coming in it will create a back pressure which allows the fan on the HS to take in more air and it will help keep dust out of your system. I only have a 2,100rpm 120mm fan (front/bottom) and a 4,300rpm fan (side of the case blowing right below the HS & F on the CPU) bringing air into my case while I have a 5,300rpm 60mm fan (at the top of the case right between the PS and the CD-ROM) and the PS fans taking air out of the case. When I did this mod, it brought my CPU temp. down by 10degrees F. I also agree that you really need to get a better HS on there and some Arctic Silver II on there for heat transfer.

[AntmanMike]

There are two problems with Pentium 4 cooling (trust me, I know). No Pentium 4 heatsink is glued to it, you put it on after you install the CPU, because it is a clip design. Also, if you dont use Arctic Silver (or Alumina or other thermal compound), the heat will SKYROCKET. Trust me! I know!

[The Doors]

Well, I must admit that I was wrong supposing that the HS on the P4 is fixed like on P///'s & Cellie's, sorry :rolleyes:

[SRB442]

Thanks for the input on this. I am going to install the digital doc 5 and try to get some good temp readings first. I will order and upgraded heatsink and fan plus some thermal compound. I can tinker with turning fans on and off with the digi doc and see if that changes things. I just wish the temp reading from bios to asusprobe were closer. I just rebooted and bios read 27c and asuprobe read 52c. Steve

[SRB442]

It's me again. I have another question. I read the heatsink reviews and tips and the getting heatsink temps article. The idea is to get the sensor in the middle of the cpu where the heatsink rests over it right? The sensor that came with the digi doc is very flat (about the same thickness as the thermal barrier on the intel heatsink). Now don't beat me up here but what if I sandwiched the sensor inbetween the heatsink and cpu with some thermal compound? Would that ruin the sensor? I could also tape it right to the edge of the cpu also. Am I way off base here. I didn't understand the drilling part of the article very well. I guess you could drill a hole in the middle of the heat sink and bury a sensor in there but would the wires come out the top or the side of the hea sink? Thanks Steve

[plague]

ok, a couple people are saying to put the sensor between the core and the hsf. do not, i repeat, do not do this! put it beside the core so it is touching the side of it. if you put it on top of the core, your heatsink is basically no good, its not even touching the core. as for your temps, you said you have no thermal compound on your core and youre using stock cooling? I think I would believe asus a little more than the bios. with that setup i highly doubt your cpu is 30C. get some arctic silver on there now.

[The Doors]

You are absolutly right plague,
I was wrong, your way is much safer than mine :rolleyes:
Another possible solution is to drill an hole in the middle of the HeatSink and fix a round thermal sensor in the hole in contact with the Cpu core, and the cable will go laterally where are the HS fins.
About the thermal paste, well, Artic Silver II is the best, generally 2-4 degree C less than generic paste, but probaably is better to use a non electric conductive paste, considering that you will use the thermal sensor.

[SRB442]

I would like to than everyone who replied on this post. I was only able to put the sensor on the edge of the cpu. I was only able to get antec reference siver thermal compund. I will get a different heatsink and fan in the coming weeks. The Digital doc 5 was not bad to install but the set up is a little trickey with what button to push at what time. Right now my cpu temp is 28.5c and I relized that is not a perfect reading (but is matchs the BIOS pretty close). Again Thanks Steve

[AntmanMike]

Make sure you use some Arctic Silver 2, Arctic Alumina, or other high grade thermal compound. Also, do not sandwich the thermal reader between the heatsink and the Core. This results in the heatsink not touching the core. As for heatsinks, I recomend the Swiftech MCX478, which you can get at Coolerguys (www.coolerguys.com)

[nil_esh]

Different software reads temps differently (usually slightly). Some of them add offsets.

I've found different temps between Hmonitor, MotherBoardMonitor, and Asus Probe. And of course the BIOS can report something different.