CPU TEMP with open case vs closed case

[imported_spike99]

Hi,

When taking idle/load CPU temp... I normally place my PC on its side and take side panel off. When I retake my idle/load CPU with PC upright and side panel closed... my idle/load temp increases by 7C as shown below.

Open case - PC laying on side
QX6850 @ 3.66GHz vcore 1.4125 Room Temp 22C
High fan core#1 25 idle, 44 load. Increase of 19C

Closed case - PC upright
QX6850 @ 3.66GHz vcore 1.4125 Room Temp 22C
High fan core#1 32 idle, 51 load. Increase of 19C

My airflow is probably not that good... but wanted to check what is the normal temp increase with an open case vs a closed case.

 

[aigomorla]

Originally posted by: spike99
Hi,

When taking idle/load CPU temp... I normally place my PC on its side and take side panel off. When I retake my idle/load CPU with PC upright and side panel closed... my idle/load temp increases by 7C as shown below.

Open case - PC laying on side
QX6850 @ 3.66GHz vcore 1.4125 Room Temp 22C
High fan core#1 25 idle, 44 load. Increase of 19C

Closed case - PC upright
QX6850 @ 3.66GHz vcore 1.4125 Room Temp 22C
High fan core#1 32 idle, 51 load. Increase of 19C

My airflow is probably not that good... but wanted to check what is the normal temp increase with an open case vs a closed case.

so it means your cable management blows. :T

Do some cable work.

http://forums.anandtech.com/me...=1846069&enterthread=y

 

[Zepper]

First you should measure the temps both ways in both orientations for the numbers to be comparable. In any case, airflow seems to be inadequate in the closed case sample. In either condition, the temps you reported are nowhere near dangerous. However, stronger fans both front and rear would probably narrow the gap. Yup, C-M cases generally come with wimpy, 40 or so CFM fans. And the 830 is kind of leaky with the mesh front.

.bh.

 

[Flipped Gazelle]

Are those bad temps for that CPU?

 

[Cutthroat]

Originally posted by: Flipped Gazelle
Are those bad temps for that CPU?

Not at all, those are nice temps.

 

[imported_spike99]

so it means your cable management blows.

Do some cable work.

http://forums.anandtech.com/me...=1846069&enterthread=y

jaja, Yeah, I know... I've got a mess of cables in my case... I need to improve my cables...

My case (CM Stacker 830) does have an option to place fans on the side panel but unfortunately, it doesn't fit with my CPU cooler (Freezone Elite).

When I get a chance I'll read up on the link you provided... This info is probably in the link... but how much of a temp increase should there be between open vs closed case.

Thanks.

DOE made the mistake of hitting EDIT instead of reply

Case and Cooling Moderator Aigomorla

 

[aigomorla]

Optimistically it should be less then 5C with the side panel on and off.

As zepper states, you probably have bad circulation.

Clean up the case and get stronger fans. :T

 

[Syzygies]

Originally posted by: aigomorla
so it means your cable management blows. :T

Except for two sata and power cables, all my cabling is behind the motherboard, as the P182 makes possible. I saw a 5 C difference with the case open, which I largely corrected by instead working on my fan arrangement.

My impressions is that very few stock cases deliver ambient temp air to the cpu cooler. Have you tried "open and closed" on any of your air rigs?

 

[imported_spike99]

Originally posted by: aigomorla
Optimistically it should be less then 5C with the side panel on and off.

As zepper states, you probably have bad circulation.

Clean up the case and get stronger fans. :T

OK, Thanks !!

I'll try to work on my cabling...

BTW, my case has a side panel for 4 fans... I had not used it before because it really didn't fit with my CPU cooler... But yesterday I was able to force it in and place 3 fans (Cooler Master A12025-12CB-3BN-F1)... It doesn't feel these fans move much air...
I looked up details for this fan:
Size: 120x120x25mm
Noise: 19.8 dBA
Speed: 1200 RPM
Air Flow: 44.03 CFM

Can anyone recommend a better/stronger fans than the one I have ?

Thanks.

 

[BlueAcolyte]

Scythe Slipstream, pretty cheap and a wide variety of noise/airflow ratios. The 1200RPM one (69CFM/24DB) is especially popular.

 

[aigomorla]

Originally posted by: Syzygies

My impressions is that very few stock cases deliver ambient temp air to the cpu cooler. Have you tried "open and closed" on any of your air rigs?

Sammy (current being drafted for full passive)

http://i125.photobucket.com/al...aigomorla/IMG_1079.jpg

http://i125.photobucket.com/al...aigomorla/IMG_1081.jpg


SMP system which im working on right now with ducts. Waiting for the CPU's to come in from a friend.

Dual CPU Intel Sossaman setup.


So yeah i know how to setup air as well as water.

Slipstreams are great fans if your not using them in front of anything. They push a lot of air unless something is blocking them, which then they just suck. Something does not mean a fan grill, more like a heat sink or filter.

 

[imported_spike99]

Originally posted by: BlueAcolyte
Scythe Slipstream, pretty cheap and a wide variety of noise/airflow ratios. The 1200RPM one (69CFM/24DB) is especially popular.

OK, an update...

I worked greatly on my cable management routing PSU cables thru one side of the case. Cables definitely now look neater and I would suppose better for air flow. I also ended buying 4 Scythe 120mm fans (SY1225SL12H - 88 CFM, 1600RPM). These were a bit loud and so I bought a fan controller (Superflower Fan Master SF-609) to lower RPM and minimize the sound.

First immpressions were that the temp had not improved at all... until I did something...
I moved my PC from under my desk and my temp improved ~ 3-4C. I still need to re-check how much improvement... but roughly 3-4C. I currently have my PC under a desk in a corner... from this... I would assume that the hot air PC exhales does not circulate very well and its not in a open space.

Also, I noticed that my case temp surprisingly increased when I had fans at full speed... and decreased when I lowered RPM. I was testing this while my PC was under desk, I think this is due to blowing of more hot air...

And finally, I have 4 temp sensors from fan controller. I placed a temp near my video card (8800GTX ULTRA) and this card generates the most heat. I have 3 fans on my side panel and the 2 bottom are directly above video card... Once again... surprisingly if increase fan to full speed.. temp from video card increases... This is very odd... When I lower RPM, temp goes a bit down... Again, I think this is due to fans blowing more hot air... Is it worth looking into a GPU cooler ? Using Everest, looks like GPU temp is at 63C. I have seen some GPU reviews... and temps are much lower going with a VGA cooler... but unlike a CPU cooler... CPU coolers tend to blow air toward the direction of rear fan.... With a VGA cooler... The hot air is pushed inside... The question is... with a GPU cooler, will I have a cooler case temp ?

Thanks for any suggestions.

 

[WoodButcher]

Put one of the temp sensors behind your fan controller. You'll be surprised how much heat that control dumps. I have a brand new superflower in my closet that I didn't use it for this reason. With one 38mm, 3000 rpm kaze on one channel I thought the thing would catch fire during testing before my build. I have 3 kaze and 3 slipstream for my rads on 2 channels and the superflower definitely would have burned.

 

[imported_spike99]

Woodbutcher,

3000RPM seems like alot of RPM's.... My fans reach 1600RPM and due to noise I set them at ~1400RPM. I did place a temp sensor at the fan controller and it was cool... I think by you giving some much volt for 3000RPM this may caused alot of heat....

With my fans, I started experimenting and for the 3 fans on the side bracket... I inverted the bottom 2 fans (the ones just above video card) from intake to exhale and it appears this made a difference....

Before: PC on side & side panel off
QX6850 @ 3.66GHz vcore 1.4125 Room Temp 22C
High fan core#1 25 idle, 44 load. Increase of 19C


After: PC with extra fans. PC standing upright and side panel on.
QX6850 @ 3.66GHz vcore 1.4125 Room Temp 22C
High fan core#1 29 idle , 51 load. Increase 22C

Looks like by inverting fans.... It is taking out the heat generated from video card... Hence having a cooler case temp.

 

[WoodButcher]

Don't use any more than one fan on each channel, when I bought it I found no reviews, now I find several but most don't mention this.

from http://www.extremeoverclocking...ower_Fan_Master_1.html

Super-Flower has made a really nice product here. The Super-Flower Fan Master will be a nice colorful addition to any modders case. One drawback, however, is that the Super-Flower Fan Master is not really capable of handling high wattage fans for 24/7 use because the transistors were overheating. So the extreme overclockers may want to look for a better solution. I did try the Super-Flower Fan Master with a Tt Smart Fan 2 and the transistor on that channel reached an incredible 70c temperature. So I would advise anyone planning on using the Super-Flower Fan master to go with a maximum of a 6 watt fan on all four channels. We did e mail Super-Flower asking them what the maximum amps/watts that were supported on each channel. We are still waiting on a response.

 

[imported_spike99]

Yes, I have 4 fans and only have 1 fan for each channel. For the fans I have... Looks to be okay... even if i set fans to highest RPM of 1600.... But due to noise, I've set them to ~ 1400RPM.