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Single 560 rad sufficient for a 4770K + 780? - Page 2

post #11 of 17
Quote:
Originally Posted by Sandkatt View Post

Haha, yeah I know. I figured if they were spinning at only 600rpm they would probably be quiet enough. smile.gif

Looking into those fans you posted and also the 140mm fan review here: http://www.xtremesystems.org/forums/showthread.php?263193-140mm-Fan-Testing-on-a-HWlabs-SR1-Radiator-Round-7

Still undecided on the fans and fan controllers but I think I'm set on the SR1 560.


I don't see the prolimatech on those graphs frown.gif most 140mm fans are pretty bad for rads because they have more or less the same CFM as 120mm and usually less SP. The prolimatech though... it has about 40% more flowrate than most standard 120mm fans, and a relatively high SP for fans (1.8mmH2O max( which is pretty good for standard RPM fans))

Then there's the BGears fans, but those aren't quiet at all biggrin.gif

Anyways, anything 16dBa will and lower will likely be inaudible because they will be overpowered by local sources (i.e. speakers, TV, anything that makes any notable amount of noise tongue.gif
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post #12 of 17
get yate loon 1650rpm fans. cheap and quiet. good REAL life on rad stats. want to spend a couple dollars more? swiftech helix, regular or pwm. martin changed out from yates to helixs according to his review.
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post #13 of 17
I'm very happy w/ my medium speed Yates on my SR1 560mm. Keep them @ 7V and they are rather quiet.
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post #14 of 17
Quote:
Originally Posted by lowfat View Post

I'm very happy w/ my medium speed Yates on my SR1 560mm. Keep them @ 7V and they are rather quiet.
i run my 1350rpm yates full blast on my fan control and i cant hear them. i sit 3 feet away from my tower with it sitting 4 inches off the floor under my desk. my excaliburs undervolted to 7v are louder and i think they are quiet. pssst, im also a machinist that doesnt wear earplugs mad.gif maybe im deaf.
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post #15 of 17
While I use and always recommend the Bgears Blasters due to their outright awesomeness, my buddy has Cougar fans on his EX rad (I also have an EX). 19 split fins per inch, and with push-pull his rig is silent and delivers excellent temps. They are actually about 2C cooler than the Noctua that were previously used..
   
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post #16 of 17
Quote:
Originally Posted by nleksan View Post

While I use and always recommend the Bgears Blasters due to their outright awesomeness, my buddy has Cougar fans on his EX rad (I also have an EX). 19 split fins per inch, and with push-pull his rig is silent and delivers excellent temps. They are actually about 2C cooler than the Noctua that were previously used..

The BGears fans are so nice because they have amazing static pressure, however; the OP is using a radiator with an incredibly low fin density, so static pressure isn't an issue here.

He would be better using really high flow fans (regardless of static pressure) in push/pull.


Don't get me wrong, the BGears are awesome fans and have an above average flowrate, but you could easily get a LOT quieter fans with probably around 100CFM, and they would work better since his radiator isn't very restrictive.
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post #17 of 17
I realize that, which is why my previous post was saying that DESPITE my usual recommendation of the Bgears, in this case I'd recommend the Cougar fans thumb.gif

However, I do disagree with part of your statement... Whether a fan is used on a 9FPI radiator, a 20FPI radiator, a 30FPI radiator, or just as a case fan, static pressure absolutely matters. Unless you have a test bench and all your fans are suspended from the ceiling by bits of string, there is always going to be some resistance to airflow. The greater the resistance, the more of the fan's "reserve" static pressure is used up, and thus the lower the total airflow.
Despite the common belief to the contrary, a 50-60mm thick radiator with 9-13fpi actually DOES benefit from fans with greater static pressure as opposed to less, simply because a much greater percentage of the fan's airflow is able to be pushed through the radiator, and at a greater velocity. The greater the velocity and volume of airflow, the greater the cooling due to the time in which the air is in contact with the fins being reduced, thus the average temp of the air going through the radiator is decreased, and the greater the differential between the air and the surface being cooled, the greater the cooling capacity.

My general rule of thumb for "How Much Static Pressure?" is this:
- 0-to-12FPI ~ 1.5-2mmH2O
- 13-18FPI ~ 2.5mmH2O
- 19-25FPI ~ 3.5mmH2O
- 26-30FPI ~ 4-4.5mmH2O
- If the RAD is thicker than 45mm, add 0.5mmH2O, and if thicker than 60mm, add 1mmH2O
- If using push-pull fans, you can reduce by 0.5mmH2O with likely no negative effect

That's a VERY BASIC guideline, and it may not work at all for others, it's just what I follow and with good results.

I use Push-Pull 106CFM/5.4mmH2O fans in push-pull on my Alphacool UT60, and they work extremely well, so don't always assume that low-FPI won't benefit from greater static pressure....
   
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