Is it normal for case temp to rise with CPU temp?

[JeffCY]

People are always talking about CPU temps but I'm curious about whether I have enough airflow in my case. My case temps are not too close to ambient temperatures under load.

 

[akira34]

Post up your system spec's/parts and temps... My case temp stays around 45C (unless the sensor is wrong) and the processor is running anywhere from 36C to 45C (depending on load)...

 

[JeffCY]

Case: Antec AMG 1000
AXP-M 2600+ (217x11.5) @ 1.725 (1.7 actual)
5 case fans, 3 intake 2 exhaust
Radeon 9800 Pro, 2 WD HDs, DVD-ROM and CD-RW

I think the front fan filter seriously lowers the airflow. My case temp ranges from about 25C-31C, CPU temps from about 35C-47C.

 

[xbassman]

Originally posted by: akira34
Post up your system spec's/parts and temps... My case temp stays around 45C (unless the sensor is wrong) and the processor is running anywhere from 36C to 45C (depending on load)...

Something is definately wrong with your numbers.
A fan blowing 45C air onto a heatsink cannot cool it to 36C. The lowest possible would be 45C and that is highly unlikely.

My overclocked 2500+ runs 20C higher than system temp @ 100% load. System is usually 1-3C above room temp. According to mbm5 and my current bios.

Do those readings jive with the readings that you get in your bios?

 

[xbassman]

Originally posted by: JeffCY
People are always talking about CPU temps but I'm curious about whether I have enough airflow in my case. My case temps are not too close to ambient temperatures under load.

If your case temp is quite a bit higher than ambient, you could probably improve airflow. With my case the single biggest improvement was made by cutting out the stock fan grills. I have quite a few wire grills lying around and put them in their place.

Remember to keep in mind that different bios's even on the same mobo can give entirely different readings.

 

[xbassman]

Originally posted by: JeffCY
Case: Antec AMG 1000
AXP-M 2600+ (217x11.5) @ 1.725 (1.7 actual)
5 case fans, 3 intake 2 exhaust
Radeon 9800 Pro, 2 WD HDs, DVD-ROM and CD-RW

I think the front fan filter seriously lowers the airflow. My case temp ranges from about 25C-31C, CPU temps from about 35C-47C.

Hey Jeff your temps are fine! and you are right, Your filters definately impede airflow.
Back when I had a Pallomino in my case I trashed my filters because CPU temp occasionally hit 72C! That processor eventually fried.

 

[akira34]

Right now, at this very second, my processor is listing 40C and the case is listing 44C. That is via MBM5 readings confirmed by both the bios AND Everest.

I'd expect an overcocked processor to run MUCH hotter than a default speed processor.

As for "cannot cool"... if the heatsink is doing it's job and pulling heat AWAY from the processor then there's no reason I can't have the numbers... I have a window about 4 feet away from the case, with a fan in it giving a slow, steady flow of cooler outside air in the direction of the computer.

I'm still thinking of doing some liquid cooling onto the processor, I just haven't ordered up the parts yet. If the weather stays about where it is now, or as it has been doing, then I probably won't go that way this year. Especially since I've not even needed to put the AC into a window (not the one with the fans, one across the room).

 

[xbassman]

Hey Akira....
I'm not trying to pick on you, but if I was getting numbers like that I would be checking for a bios update or try an older bios.
44C is quite hot for system temp. Even @ stock clock speed your processor shouldn't be reading lower than system temp unless your bios is giving erroneous readings or the sensor is in a really bad location.
I had an Asus A7V133 that changed readings with almost every bios release!

 

[akira34]

There are no bios updates on this mobo, yet. There's just the original bios available... I won't use beta bios updates either, even though there are none available. This is not the first system I've either built or had that has higher case temps than the processor temps. I've had the opposite as well, it really depended on how good the processor cooler is/was and what else was/is generating heat. I do have two case fans in the rear holders venting out, and the heatsink fan almost directly above the processor. Those three fans could be pulling all that extra heat off the processor area. Especially if the case temp sensor is below the video card or in an area that doesn't cooled as fast.

BTW, the computer has been running most of the day... For the past few hours it's been at the posted temps, not changing more than 1C on either the processor or case.

 

[xbassman]

I agree beta bioses aren't something I would run either.....

Here's a cut and paste from the MSI K8N Neo Platinum FAQ

1.2b10 - (Download)
- First attempt to fix false temperature readings. Fixes it for some people with Newcastle cores and doesn't fix it for anybody with Clawhammer cores.

1.2b12 - (Download)
- Second attempt to fix false temperature readings. Fixes it for some people with Newcastle cores and some people with Clawhammer cores.


It appears that they are working to correct the temp readings.

 

[koojoe]

Originally posted by: akira34
Post up your system spec's/parts and temps... My case temp stays around 45C (unless the sensor is wrong) and the processor is running anywhere from 36C to 45C (depending on load)...

Your temp sensors are backwards. My old mobo did the same thing. Soyo Dragon k7v plus.

you can't have a processor cooler than the ambient air temp around it.. unless you're using a pelt or chiller of some sort...

 

[Sheriff]

It's normal for the Mobo temps to increase with the CPU temps...Science tells us that. If you have an enclosed Case with or without Fans and an internal part increases in Temps then it will effect the surrounding areas in general...

 

[Operandi]

Originally posted by: akira34
Right now, at this very second, my processor is listing 40C and the case is listing 44C. That is via MBM5 readings confirmed by both the bios AND Everest.

I'd expect an overcocked processor to run MUCH hotter than a default speed processor.

As for "cannot cool"... if the heatsink is doing it's job and pulling heat AWAY from the processor then there's no reason I can't have the numbers... I have a window about 4 feet away from the case, with a fan in it giving a slow, steady flow of cooler outside air in the direction of the computer.

I'm still thinking of doing some liquid cooling onto the processor, I just haven't ordered up the parts yet. If the weather stays about where it is now, or as it has been doing, then I probably won't go that way this year. Especially since I've not even needed to put the AC into a window (not the one with the fans, one across the room).

Im not a motherboard designer or anything but I suppose that could be possible. On average the temp within the case would HAVE to be lower then the temp of the processor, thats physics no way around it. Motherboard temps can vary greatly though, if the temp is being read near the power regulators for example 44c might be about right.

 

[Cheetah8799]

In my rig, which is highly modded for a LOT of airflow, the ambient temp stays somewhat close to CPU temp. Even more so now that it is summer time here in Minnesota. During the winter, the ambient temp rises less when cpu temp goes up.

 

[akira34]

Ok, not exactly sure why, but I did a little mod to how the drives are inside the case (trying to get better air flow). I moved the hard drives into the same cage as the floppy, put both extra case fans onto the mobo (instead of the power supply) and now i'm getting temps (reading from MBM5) of... Case: 40C CPU: 36C... When I first turned it on, after being off all evening and before I did the changes, the case temp was reading lower than the processor temp. I'm getting about 1C fluctuations in the temps with the case reading going up to 41C and then dipping to 40C. If it is a flaw in the bios readings, I'll wait for the next official bios release from MSI before I update. As soon as I know about it, I'm going to grab and install it. I just hope the numbers I'm seeing are false highs and that the update will make them accurate (and lower).

 

[Arsynic]

It's good for the case temp to be around 5C higher than the room temp. If it's higher than that, then you need to get more cool air in your case and/or more hot air out.