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Fans fits on CPU cooler? - Page 3

post #21 of 25

Take for example the dB rating. That dB rating could very likely be the dB reading that they got at the fan's lowest speed.

 

The CFM rating is likely what the fan does at its highest speed, and only at its highest speed.

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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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post #22 of 25
I don't simply trust what the packaging says. However, if every source that I can find tends to say the same thing, then it's reasonable to put some faith in those specs. Essentially, I'm just saying that the fan I recommended is a very suitable partner for the stock 212 EVO fan, since they move at the same/similar rates - one will not overpower the other and cause unneccessary stress....
post #23 of 25

What they aren't putting on the box or on their product page is how they arrived at their CFM reading, nor are they saying what speed the fan needs to be at in order to achieve that. They also don't tell us what the CFM reading is or would be at all the different speeds that we would likely be using. In other words, they don't tell us what fan speeds they used in order to obtain the ratings that they give it. Yeah it's likely the highest fan speed, but we don't really know that. Also, they are likely testing the fans "naked", as opposed to being mounted in a case or on a heatsink.

 

Perhaps the biggest problems are: we also don't know how accurate their testing equipment is. Are they all using the same equipment? I doubt it. Do they all know what they're doing? Is the same person doing all of the testing for all of the company's fans? Would all of the employees who do the testing get the exact same readings for the exact same fan? How consistent are their products? Do all of the fans produce the exact same results, or are they cherry-picking fans from each model line in order to get the best ratings?

 

I am no expert, but I would bet that these are things to consider.

It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.400-1.424V in Manual Mode) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:) 250 GB Samsung 840 EVO (D:) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #24 of 25
Biggest problem with most publish specs is CFM is figured in open air use. 80cfm on a empty bench top may only be 40cfm in actual use... dBA readings have the same problem. Noise is very different when fan is sucking or blowing through a grille or cooler. Don't forget Static Pressure reading is the most rise fan can produce in water column in mm before air stops moving.. static.. still.. stop. And it is not uncommon for a fan with lower static pressure and lower cpu to flow more air at have the static pressure rating than a fan with higher static pressure and cfm specs tested on same machine. This graph of AP-15 and Cougar Vortex is a good example of how the specs and real life use are not even close.

http://martinsliquidlab.org/2013/02/18/why-static-pressure-max-flow-specs-are-poor-measures-of-fan-performance/
post #25 of 25
Good information to have. My recommendation on the Shark fan comes from my personal experience using it with the Hyper 212 EVO. It's an awesome fan that's priced well, and compliments the stock EVO fan very nicely.
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