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H60 Intake/Exhaust with AP15's Testing & Results

post #1 of 8
Thread Starter 
So, there are still too many people running their radiators as exhaust, with one fan or two in push/pull. I have personally tested both configurations in push/pull. The results are below!

Test Setup, CPU Overclock & Other Hardware:

CPU: AMD 955BE @ 4GHz, 1.416v, 20x200. NB at 2800MHz with 1.285v, HTT at 2400MHz at stock voltage.
RAM: 2x2GB G.Skill PI Black @ 1600MHz 8-8-8-24-2T
MB: ASRock 890GX Extreme4 R2.0
PSU: Silverstone ST60F-P Strider Plus 600W
CASE: CoolerMaster Storm Scout


Intake

Ambient temp: 15c
Idle temp: 24c
Load temp: 51c


Pictures:

Idle



Load



Exhaust

Ambient temp: 15c
Idle temp: 26c
Load temp: 55c


Pictures:

Idle



Load



Conclusion

At least in my case (situation and which case I use, pun not intended), intake gets better idle and load temperatures. Differences in ambient, case, CPU, overclock and voltage will all have an affect on temperatures. You can see the results, so I would say it is safe to say that having the fans set as intake will work better in all scenarios, as cool air coming through the rad from outside, and the air exhausting through the top case fan should in theory and in practice, beat exhausting already warm air through the radiator and out the rear of the case. Also keep in mind that the fan against the radiator and not the case will be fighting for air with the top exhaust fan. Warm air rises, which is why it makes sense to run intake in most cases, as the cool air will come in through the rear, and be exhausted by the top fan.

Other Notes

It's currently the coldest month of the year in Australia. We even had a small amount of snow a few days ago. Obviously my ambient temp is quite cold (even for me!) and it affects idle and load temps. In the northern hemisphere it is summer. The higher ambients will also affect your temperatures. There's not a lot that can be done about that, besides aircon, which I don't have, so winter is overclocking season

I hope this testing will make people realise running intake on radiators, especially these all in ones units, is the way to better temperatures. Better temperatures means more voltage can be added and you can achieve a higher overclock!
post #2 of 8
Have you got LLC or a similar setting on?
It seems that your CPU is running at 800 MHz when the stress test is running.
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post #3 of 8
That's just the maximum temp after he ran the test. You can see in the IBT on the load pics that it has the start option instead of stop.
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post #4 of 8
Nice in away, but ,Ambient temp: 15c ? Thats pretty cool compared to what most people deal with unless your AC is cranking.
    
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post #5 of 8
There are several reasons why people run it as exhaust.
1. Keep dust out of case (intake case is pulling in unfiltered air through the back of the case which requires more frequent cleaning)
2. Unless ur passively cooling hot air does not rise it goes wherever u blow it
3. Don't like the idea of blowing hot air into case just to get a degree or two better temP on CPU while other components heat up more (mb,ram,etc)
post #6 of 8
Thread Starter 
Quote:
Originally Posted by Kieran View Post
Have you got LLC or a similar setting on?
It seems that your CPU is running at 800 MHz when the stress test is running.
I have LLC set to the lowest option (1/4). Voltage is set at 1.45v in UEFI. CPU was running at 4GHz 1.416v during the test, the screenshots are before and after, with temps next to it.

Quote:
Originally Posted by Twinkadink View Post
That's just the maximum temp after he ran the test. You can see in the IBT on the load pics that it has the start option instead of stop.
Spot on

Quote:
Originally Posted by fishhawk View Post
Nice in away, but ,Ambient temp: 15c ? Thats pretty cool compared to what most people deal with unless your AC is cranking.
Yeah it's cold... Too cold for me I even have a heater on.

Quote:
Originally Posted by Youngd8 View Post
There are several reasons why people run it as exhaust.
1. Keep dust out of case (intake case is pulling in unfiltered air through the back of the case which requires more frequent cleaning)
2. Unless ur passively cooling hot air does not rise it goes wherever u blow it
3. Don't like the idea of blowing hot air into case just to get a degree or two better temP on CPU while other components heat up more (mb,ram,etc)
1) Good point.
2) Cool air coming on from the rear, exhausted out into the case, where the top fan sucks it out of the case.
3) See above.

With intake, any hot air from the GPU's or other components in the case will not affect CPU/Radiator temps. All hot air coming into the case once it's gone through the radiator will be exhausted by the top fan in your case, along with the air from any GPU's or other hardware. Therefore, when mounted top rear, intake is the best option. Better CPU temps and it won't affect any other hardware, because the air will be exhausted out of the case through the top fan anyway.

Thanks for the comments
post #7 of 8
I switched to an exhaust system last week and my results are similar to yours.

2 AP-15 pull/push

2 AP-15 on the top of the case as intake

My temps went up by a few degrees
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post #8 of 8
Thread Starter 
Well at least that confirms what I tested. I assume you changed back to intake?
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