CPU Temperatures & Air Flow

ndpowell · 2005-06-21, 02:22

I recently upgraded this computer to a P4 2.8GHz CPU. As part of that process, I was able to locate a software app that monitored the CPU, and internal case temperatures. It also allows for manual adjustment of the fans. When I would start Prime95, the fans would jump up to full power within about 15 seconds. The temps in the case would jump up about 8C. The CPU would run up to around 65C. The case fan was overpowering the power supply fan, setting up a reverse flow, and pulling all the heated air down into the case. Since the power supply was providing a never-ending supply of heated air, the temps ran well above what I expected. The give-away was when I took one of the side covers off. The temps dropped "rapidly" and the fans slowed to about half speed. It was then that I realized the situation. The software app that I use is called "SpeedFan." It is freeware. I set both fans to run at 75%. Now, at that settting, the CPU temp runs at a consistent 58C. The little fan in the power supply is able to do its job again. If anyone is having heat problems, this may be something to look at.

outlnder · 2005-06-21, 06:41

Case side?

What's a case??

lycorn · 2005-06-21, 10:40

I certainly am more moderate than outlnder, as I just ask "What´s a side...?"

Cruelty · 2005-06-21, 14:54

Is your PSU fan (I guess at the back top of your case) blowing air into the case, and case fan (I guess at the front bottom of the case) is blowing air out of your case

In such event you really have something wrong with your config, because it should be quite the opposite :surprised

dsouza123 · 2005-06-21, 18:33

The outside shell of the PC is called the case or cover
and is made of metal or plastic,
some PCs instead have separate pieces
such as removable side panels and front bezel
but usually a non removable top.

ndpowell · 2005-06-22, 01:04

Quote:

Originally Posted by Cruelty

Is your PSU fan (I guess at the back top of your case) blowing air into the case, and case fan (I guess at the front bottom of the case) is blowing air out of your case

In such event you really have something wrong with your config, because it should be quite the opposite :surprised

It is at the back top. The, much more powerful, case fan was negating the PSU fan, pulling air in through the back of the PSU, past the PSU's fan, and then down into the case. The PSU fan is at the back.

ndpowell · 2005-06-22, 01:06

Quote:

Originally Posted by dsouza123

The outside shell of the PC is called the case or cover
and is made of metal or plastic,
some PCs instead have separate pieces
such as removable side panels and front bezel
but usually a non removable top.

Exactly right. Mine has removable side panels.

Cruelty · 2005-06-22, 06:07

Quote:

Originally Posted by ndpowell

It is at the back top. The, much more powerful, case fan was negating the PSU fan, pulling air in through the back of the PSU, past the PSU's fan, and then down into the case. The PSU fan is at the back.

You would get much better performance if you moved case fan from top back position to front bottom - if that is possible in your case.

outlnder · 2005-06-22, 06:10

Why would you want to put your valuable motherboard and CPU into a piece of metal or plastic. I would think you would want them out where everyone could see the integral parts and marvel at your creation.

It's also so much easier to replace things that wear out or break. If I had to purchase a case everytime I bought a new CPU, motherboard and stuff, my apartment would be full of them.

The discription makes me think that they are quite ugly. I will do a search on "case" and look at them.

Wacky · 2005-06-22, 07:54

Quote:

Originally Posted by Cruelty

You would get much better performance if you moved case fan from top back position to front bottom - if that is possible in your case.

I think that the fundamental problem is that he has two fans trying to draw air out of the box.
He needs bigger vent holes in the bottom to get more air into the box.

akruppa · 2005-06-22, 08:21

Or turn the case fan around and make it push air in instead of drawing it out. Put it on a vent hole furthest away from the PSU so the air flow runs through the entire case.

Alex

2005-06-21, 02:22	#1
ndpowell Jun 2005 Madison, Indiana, U.S.A. 3·7 Posts	CPU Temperatures & Air Flow I recently upgraded this computer to a P4 2.8GHz CPU. As part of that process, I was able to locate a software app that monitored the CPU, and internal case temperatures. It also allows for manual adjustment of the fans. When I would start Prime95, the fans would jump up to full power within about 15 seconds. The temps in the case would jump up about 8C. The CPU would run up to around 65C. The case fan was overpowering the power supply fan, setting up a reverse flow, and pulling all the heated air down into the case. Since the power supply was providing a never-ending supply of heated air, the temps ran well above what I expected. The give-away was when I took one of the side covers off. The temps dropped "rapidly" and the fans slowed to about half speed. It was then that I realized the situation. The software app that I use is called "SpeedFan." It is freeware. I set both fans to run at 75%. Now, at that settting, the CPU temp runs at a consistent 58C. The little fan in the power supply is able to do its job again. If anyone is having heat problems, this may be something to look at.

2005-06-22, 06:10	#9
outlnder Aug 2002 2×3×53 Posts	Why would you want to put your valuable motherboard and CPU into a piece of metal or plastic. I would think you would want them out where everyone could see the integral parts and marvel at your creation. It's also so much easier to replace things that wear out or break. If I had to purchase a case everytime I bought a new CPU, motherboard and stuff, my apartment would be full of them. The discription makes me think that they are quite ugly. I will do a search on "case" and look at them. Last fiddled with by outlnder on 2005-06-22 at 06:12

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2005-06-21, 06:41	#2
outlnder Aug 2002 2·3·53 Posts	Case side? What's a case??

2005-06-21, 10:40	#3
lycorn "GIMFS" Sep 2002 Oeiras, Portugal 3×491 Posts	I certainly am more moderate than outlnder, as I just ask "What´s a side...?"

2005-06-21, 14:54	#4
Cruelty May 2005 11001011000₂ Posts	Is your PSU fan (I guess at the back top of your case) blowing air into the case, and case fan (I guess at the front bottom of the case) is blowing air out of your case In such event you really have something wrong with your config, because it should be quite the opposite :surprised

2005-06-21, 18:33	#5
dsouza123 Sep 2002 2·331 Posts	The outside shell of the PC is called the case or cover and is made of metal or plastic, some PCs instead have separate pieces such as removable side panels and front bezel but usually a non removable top.

2005-06-22, 08:21	#11
akruppa "Nancy" Aug 2002 Alexandria 2,467 Posts	Or turn the case fan around and make it push air in instead of drawing it out. Put it on a vent hole furthest away from the PSU so the air flow runs through the entire case. Alex