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Air flow optimized fans for pull on a radiator bad idea? - Page 2

post #11 of 28
Please don't get SP120s.

They are very loud without a performance payoff.

NF-F12s, E-loops, Cougars and Gentle Typhoons are all much better.


Although - it is a very good idea to have different fans in push than in pull.
Edited by Wihglah - 7/13/14 at 4:07am
post #12 of 28
All fans at 2300 RPM are loud. There is no law that says they have to be used at that speed though.

That video has been posted a lot but it proves nothing beyond the extra airflow from higher speed fans did little extra to cool the CPU. Not unusual on a small radiator and highly clocked CPU. Voltage has a much higher effect on CPU temps in those conditions than rad airflow.

Its entirely possible that if the SP fans were slowed to the same speed as the GT's the results would have been the same.

Martin tested the SP 120's against all those fans mentioned and found them better than most.
GT's just aren't available and Eloops buzz in push pull.
Edited by Jakusonfire - 7/13/14 at 4:12am
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post #13 of 28
Quote:
Originally Posted by Jakusonfire View Post

All fans at 2300 RPM are loud. There is no law that says they have to be used at that speed though.

That video has been posted a lot but it proves nothing beyond the extra airflow from higher speed fans did little extra to cool the CPU. Not unusual on a small radiator and highly clocked CPU. Voltage has a much higher effect on CPU temps in those conditions than rad airflow.

Its entirely possible that if the the SP fans were slowed to the same speed as the GT's the results would have been the same.

Martin tested the SP 120's against all those fans mentioned and found them better than most.



That's a 3770k @ 5.3ghz on a H80 in push only.

Extra airflow will always lower the CPU temp in that setup.

SP120's look good, but do not perform very well at all.
post #14 of 28
Quote:
Originally Posted by Wihglah View Post

That's a 3770k @ 5.3ghz on a H80 in push only.

Extra airflow will always lower the CPU temp in that setup.

SP120's look good, but do not perform very well at all.

No it won't.

Why doesn't the video show them running at the same speed? At very high airflow levels the water temp only changes by a small amount because its already low. It is bumping against the efficiency limit of the radiator and the CPU to block interface.

And its a 2600K, in pull ... for a whole 2 minutes.
Edited by Jakusonfire - 7/13/14 at 4:29am
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post #15 of 28
Quote:
Originally Posted by Wihglah View Post

That's a 3770k @ 5.3ghz on a H80 in push only.

Extra airflow will always lower the CPU temp in that setup.

SP120's look good, but do not perform very well at all.

Air through the rad doesn't even cool the CPU, it cools the coolant which cools the CPU. If I have 2c coolant/ambient deltaTemps, and I quadruple the airflow my thermal gains or rather thermal drops on the CPU would be negligible.
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post #16 of 28
SP in push/pull.
 
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post #17 of 28
Quote:
Originally Posted by Jakusonfire View Post

No it won't.

Why doesn't the video show them running at the same speed? At very high airflow levels the water temp only changes by a small amount because its already low. It is bumping against the efficiency limit of the radiator and the CPU to block interface.

And its a 2600K, in pull ... for a whole 2 minutes.

So what you are saying is the SP is a really good noisemaker above 1850rpm, but doesn't help temps by running at that speed?



Quote:
Originally Posted by ZytheEKS View Post

Air through the rad doesn't even cool the CPU, it cools the coolant which cools the CPU. If I have 2c coolant/ambient deltaTemps, and I quadruple the airflow my thermal gains or rather thermal drops on the CPU would be negligible.

LOL. 2*C delta.

Good one, how come my CPU runs 6*C cooler at 1450rpm than at 1000rpm then?
Edited by Wihglah - 7/13/14 at 4:52am
post #18 of 28
Quote:
Originally Posted by Wihglah View Post

So what you are saying is the SP is a really good noisemaker above 1850rpm, but doesn't help temps by running at that speed?

Not in that situation it may not. Just the same as if the GT's were sped up to the same speed.

Or are you saying that GT's at 1850rpm produce the same airflow as SP's at 2350rpm.

Seriously, its an impressive video at first glance or if you don't understand what is going on. Its deliberately set up that way. No credible testing would be done at different speeds for these exact reasons.

Why not show how much better the GT's cool than the SP's at the same speed? Instead of a 1C difference why not show a bigger difference but at the same speed if that is what you are suggesting was happening?
Because there likely wasn't a huge difference and that doesn't make a good video.
Edited by Jakusonfire - 7/13/14 at 5:29am
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post #19 of 28
Quote:
Originally Posted by Wihglah View Post


Good one, how come my CPU runs 6*C cooler at 1450rpm than at 1000rpm then?

For SO many reasons. 1: Too low radiator space 2: Not enough fin density 3: Not enough pressure to generate airflow turbulence 4: Too high fin density creating limited airflow 5: Too low coolant flow making high thermal fluctuation within the loop I could list a few more reasons but I think I've made my point. I don't know much of anything about your loop, so I really couldn't say.
Quote:
Originally Posted by Jakusonfire View Post

Not in that situation it may not. Just the same as if the GT's were sped up to the same speed.

Or are you saying that GT's at 1850rpm produce the same airflow as SP's at 2350rpm.

Seriously, its an impressive video at first glance or if you don't understand what is going on. Its deliberately set up that way. No credible testing would be done at different speeds for these exact reasons.

It's also done with a corsair AIO CLC, flowrates within those kits are deplorable so I HIGHLY doubt the selected fan will make much of a difference since coolant turbulence will be much more of a finite limiting factor than airflow turbulence.
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post #20 of 28
Quote:
Originally Posted by ZytheEKS View Post

For SO many reasons. 1: Too low radiator space 2: Not enough fin density 3: Not enough pressure to generate airflow turbulence 4: Too high fin density creating limited airflow 5: Too low coolant flow making high thermal fluctuation within the loop I could list a few more reasons but I think I've made my point. I don't know much of anything about your loop, so I really couldn't say.

ROFLOL

So an RX 360 V3 (the best performing rad design available) isn't enough for a 4770K? You have made no point whatsoever, other than you do not know what you are talking about.
Edited by Wihglah - 7/13/14 at 6:50am
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