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Windows 7: Improving airflow? More fans=higher temps

12 Jun 2012   #1
Surgikill

Windows 7 64 bit
 
 
Improving airflow? More fans=higher temps

Hey guys I have a few questions. I want to improve temps in my case but everything i seem to do makes it worse. I routed all of my cables into the right side panel of the case and i added some more exhaust fans and a cpu fan. This has caused my temps to rise. I use realtemp to monitor my temps and it is consistent and accurate. I will include pictures of my case so you can understand my airflow

Blue is cold air intake and red is exhaust, the blue circle is a side panel fan.
Temps are under a small load and ambient case temp is 27c

EDIT: The max temps you see were under prime95




Attached Thumbnails
Improving airflow? More fans=higher temps-2012-06-12_17-24-05_162.jpg  
Attached Images
Improving airflow? More fans=higher temps-.pyi.png 
My System SpecsSystem Spec
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12 Jun 2012   #2
Muad Dib

XP Pro & Vista Home Premium (x86); Windows Ultimate 7600 x64 Retail
 
 

How long did Prime95 run before the Max temps were reached? Are those the "stable" prime95 temps?

Reason I ask is I am going through the same exercise as you. And with an almost identical case/fan arrangement. I do not have SLI video cards. Just a sing MSI TF III GTX 570.

If the max temps you displayed are SUSTAINED temps, i.e. Prime95 running for a long period with the temps you listed, I don't believe they are excessive. You have not hit the dreaded 70C. Also Prime95 is meant to stress a system. It is not a "real world" usage statistic IMO.

You don't list your GPU temps. You might want to check out CPUID HWMonitor which will give you more of the monitored temps and fan speeds.

As for me I am trying to keep temps UNDER LOAD (gaming) at CPUs <= 60C and Video Card <= 65C.

Biggest problem I have is keeping noise level reasonable under gaming load. I have installed the Sunbeam PL-RL-6 allowing me to switch all fans from PWM to Manual to OFF in an effort to test the noise/cooling benefit of each fan.

Just ordered a TY-140 fan to replace the top exhaust 120mm. Hope it helps with noise/cooling.

For some interesting test results on cooling see The Big Air Cooling Investigation | bit-tech.net

The jist is to stream the air flow over the hardware and THROUGH the case. Too many fan or too strong a fan in the wrong place will cause turbulence but not necessarily cooling.
My System SpecsSystem Spec
12 Jun 2012   #3
Surgikill

Windows 7 64 bit
 
 

I believe gpu is around 60 to 65 under load, not sure in the different climate. I have a fan curve set up, only problem is it starts to sound like a jet engine with both of them going. I removed the cpu fan and obviously temps got higher, but I,m thinking of moving it to the top of the cooler in order to streamline the airflow more and not have it work against the natural current of heat rising, problem is space is limited. Will having it over my ram like that affect it at all? Im also going to have to blow dust bunnies out of the fins, should lower it a few C.
My System SpecsSystem Spec
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12 Jun 2012   #4
Wishmaster

Windows 7 Home Premium 64bit
 
 

Try lowering the speed of the top 2 exhaust fans. Run them at low, rear exhaust at Med or so, and the intake at high.
Essentially, try to make it so more is coming in than exhaust, or close to equal.

If possible, Try mounting one of the top exhusts fans a a second intake. Some cases are different, and do better with a Negative pressure setuip and others do better with a positive pressure setup.
Just experiement a bit.
My System SpecsSystem Spec
12 Jun 2012   #5
Surgikill

Windows 7 64 bit
 
 

Rearranged some stuff according to that article. Barely noticeable temp difference. Ambient case temp is 26C.


There is a cpu cooler fan there, the pic is just an older pic of the case. Wondering if I should make the top fan an intake and make the case positive pressure and just leave the other vent open for a convection current. I used to be able to keep this thing at 50 to 55c under load.

New Max temps have updated and are 64 63 59 and 65 respectively. So much for an improvement.


Just did a stress test with battlefield 3 and top gpu reached a max of 69c (lol) and a min of 51
gpu2, bottom gpu, had a max of 61 and a min of 45.
Ambient case temp was 29C

I want to keep these temps lower but am running out of options, may just have to stick the old ac into the window. Any tips on cooling down my gpus more? I think tomorrow I will make that top fan an intake and then a majority of the case will be positive pressure, which I understand works for better cooling with gpus.


Attached Thumbnails
Improving airflow? More fans=higher temps-2012-06-11_20-47-55_781.jpg  
Attached Images
Improving airflow? More fans=higher temps-.pyxdupixb.png 
My System SpecsSystem Spec
13 Jun 2012   #6
Muad Dib

XP Pro & Vista Home Premium (x86); Windows Ultimate 7600 x64 Retail
 
 

You might want to adjust the side panel fan speeds if you can. To much air flow could actually be starving the air intakes on the upper GPU due to turbulence and the narrow space for air flow between the two GPUs. If the flow is too strong the turbulence can create a negative pressure in that gap actually fighting against the GPU fans.

In tinkering with my setup I reset the GTX 570 fan profile back to the default and actually lowered the side panel fan speed from being PWM driven to a fixed RPM.

The results of a 15 minute Unigine Heaven test with the GTX 570 core OCed to 870:

Improving airflow? More fans=higher temps-unigine-heaven-870-core-061312.jpg

The new TY-140 for the top exhaust and a second side panel 120mm I think will do the trick.

Having the fan controller has now made it very apparent in my case that under load the LOUDEST fan in my system is the CPU cooler. It is a 4 year old Arctic Freezer Pro Rev. 2. The fan at 1264 RPM sounds loud and rough. So... time to shop for deals on new CPU Cooler and better 120mm - one of my cheap ones has an annoying whine at higher RPM.


My System SpecsSystem Spec
13 Jun 2012   #7
pparks1

Windows 7 Ultimate x64
 
 

Are those temperatures a problem? Those are well within the specs of the CPU, aren't they?

I run a single Nvidia GTX 570 and I run around 80C when running BF3...but as far as I know, that's also well within specs for that GPU.
My System SpecsSystem Spec
13 Jun 2012   #8
Surgikill

Windows 7 64 bit
 
 

Its within spec but I know that heat is the enemy. I have a fan controller and it auto adjusts the fans in accordance with the case temp, I don't have the temperature sensors placed anywhere, they wont stick and its a big pain. I will try adjusting the side panel fan, I only have room for one. I am also running these cards oced to 810/1620/2000, so these temps may actually be good, but I don't know.
My System SpecsSystem Spec
13 Jun 2012   #9
Fantail

7 x64 | 7 x64
 
 

Are you runing a raid set-up? If not try taking storage drives out and network / external case them. I wonder if all the extra fans are drawing some heat off your power supply.
My System SpecsSystem Spec
13 Jun 2012   #10
pparks1

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Surgikill View Post
Its within spec but I know that heat is the enemy. I have a fan controller and it auto adjusts the fans in accordance with the case temp, I don't have the temperature sensors placed anywhere, they wont stick and its a big pain. I will try adjusting the side panel fan, I only have room for one. I am also running these cards oced to 810/1620/2000, so these temps may actually be good, but I don't know.
While heat can be an enemy, these devices are intended to run under a certain amount of heat and hold up. It's only really excessive heat that is reason for concern. For example, if your CPU temps hit say 65C, they might last 7 years. But if they are at 55C they might last 7 years and 2 months....but in the even, both lengths of time are probably longer than the desired use of the equipment anyway.
My System SpecsSystem Spec
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