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Hyper 212+ testing, Push vs Pull vs Push Pull; Also Horizontal vs Vertical positioning - Page 12

post #111 of 248
@ axipher, I will do the same as you have done. Instead of buying two new fan I'll now only buy one instead as in order to use 212+ with dual fans I already have a 90mm fan that is a very high rpm (4600rpm) fan. I think I will be able to mount this 90mm fan on 212+ without a problem. Also, as there will be now two different rpm fans i.e. 2000rpm (one that comes with 212+) and one which I have (4500rpm, but I will be running it at around 3000rpm coz it is very loud at 4500rpm). So, how should I mount these two fans i.e. high rpm fan, blowing air into fins or pulling out from fins to rear fan? Lets, say if I mount this high rpm fan pulling air towards rear exhaust fan, then as this is spinning higher than rear fan (2000rpm), is there a possibility that the rear one will be having interruption in its rotation due to heavy air flow coming to it but it cannot handle that heavy air flow due to its slow speed.
What do you think??? What should I do?
post #112 of 248
Quote:
Originally Posted by AshutoshM View Post

@ axipher, I will do the same as you have done. Instead of buying two new fan I'll now only buy one instead as in order to use 212+ with dual fans I already have a 90mm fan that is a very high rpm (4600rpm) fan. I think I will be able to mount this 90mm fan on 212+ without a problem. Also, as there will be now two different rpm fans i.e. 2000rpm (one that comes with 212+) and one which I have (4500rpm, but I will be running it at around 3000rpm coz it is very loud at 4500rpm). So, how should I mount these two fans i.e. high rpm fan, blowing air into fins or pulling out from fins to rear fan? Lets, say if I mount this high rpm fan pulling air towards rear exhaust fan, then as this is spinning higher than rear fan (2000rpm), is there a possibility that the rear one will be having interruption in its rotation due to heavy air flow coming to it but it cannot handle that heavy air flow due to its slow speed.
What do you think??? What should I do?

You should separate your post into sections, a big wall of text like that is difficult to read for most people.


To answer your question though:


1) You don't want different fans as push/pull

2) The 212+ doesn't really benefit from having push/pull as the results have shown.

3) RPM is not how to determine a fan's power, blade count and design drastically affect airflow and static pressure of a fan. For example, my Gentle Typhoon AP-15's spin much slower then my Scythe Slipstreams but produce more airflow when put against a RAD or heatsink because they have higher static pressure.
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post #113 of 248
Thread Starter 
as said above, don't use different fans, if you looked at the first post in more detail, you would see that push pull won't help with 2 of the same fans, 2 different fans especially in different sizes would only decrease performance
   
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post #114 of 248
Quote:
Originally Posted by axipher View Post

You should separate your post into sections, a big wall of text like that is difficult to read for most people.
To answer your question though:
1) You don't want different fans as push/pull
2) The 212+ doesn't really benefit from having push/pull as the results have shown.
3) RPM is not how to determine a fan's power, blade count and design drastically affect airflow and static pressure of a fan. For example, my Gentle Typhoon AP-15's spin much slower then my Scythe Slipstreams but produce more airflow when put against a RAD or heatsink because they have higher static pressure.

Sorry about that. I will divide my post into smaller sections.

Regarding what I had said in my earlier post that when two different fans are used, the one which is slower will bottleneck the one which
blows more air/s.

So, I'll be testing which config. that is two similar fans or two different fans work better.

Regarding the fan RPM, you are right that only RPM can't decide the air flow of a fan but in my case, the larger rpm fan is so louder and
faster that even if I combine two 120mm 2000rpm fans, they can't beat this beast!
post #115 of 248
Thread Starter 
its not the slower bottlenecking the faster, because the blademaster pushes a lot of air, its also a lot bigger, so it pushes air around it.
   
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post #116 of 248
Quote:
Originally Posted by chinesethunda View Post

if you cut out your rear grill, you wouldn't need the fan in the back, and your push pull would be much more effective

rear grille's been cut out. I just need to either get some plasticard to create the duct or find some hardwall dryer flexible ducting to attach to the fan.

sort of like this stuff...

BE-1630-2.jpg
    
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post #117 of 248
Quote:
Originally Posted by Captain Mayhem View Post

rear grille's been cut out. I just need to either get some plasticard to create the duct or find some hardwall dryer flexible ducting to attach to the fan.
sort of like this stuff...
BE-1630-2.jpg

wait! you also cut the mounting holes?
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post #118 of 248
no, didn't cut any of the mounts out. just the entire screen. Did it when the system was live, but not on.

Taped up both sides to make sure no errant metal particles got away, and pulled it out.
    
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post #119 of 248
Thread Starter 
sounds good, how do your temps look now?
   
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post #120 of 248
I had 2 Excalibur coolermasters on my old 212+

Didn't notice a heck of a lot of difference as has been found here with push-pull configuration

I bought the new 212 evo installed and ran with the stock supplied fan for about 15 minutes, prime 95.

Then shut down swapped out hooked up a single Excalibur fan made by coolermaster, primed away again for 15 minutes

So the stock fan ran oh about 1500's + rpm and the Excalibur runs around 2000's + rpm under prime 95 loads
with no loads the oem fan runs bit slower than the Excalibur maybe 200 rpm-+

As far as I could tell its no way scientific by any means the temps were essentially the same between the two fans
Though the Excalibur turns faster

The 212 evo oem supplied 120mm fan compared to its more expensive Excalibur 120mm has a different bearing system and i believe longer use rating on Excalibur
also the Excalibur has a metal mesh around the circumference of the fan.
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