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How important is fan CFM in watercooling?

post #1 of 9
Thread Starter 
Just got the Thermaltake water 2.0 pro installed and did a stress test after idling after 40 mins and my temps haven't changed from the tuniq tower air cooler to the water but there is a little difference in stress test. It's gone from 61/57/63/62c on air to 62/55/60/60c on water. But I'm not using the thermaltake fans, I'm using a couple of scythe s-flex 63CFM quiet fans and I believe the Thermaltake fans do around 81CFM.

I have a couple of silverstone 110CFM fans I can throw in there instead to maybe get the temps down but at the cost of the PC sounding like a jet engine - these things are LOUD.

So will using these silverstone's or the stock Thermaltake fans bring the temps down a little more?
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post #2 of 9
ive been told that what matters most is the ability to produce air pressure over actual CFM This is why preferred water cooling fans are different from preferred air cooling fans.
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crucial ct960 LG blu-ray used venamous x win 8.1 pro 
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Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by bombastinator View Post

ive been told that what matters most is the ability to produce air pressure over actual CFM This is why preferred water cooling fans are different from preferred air cooling fans.

Maybe I'll experiment some and change the fans out to the thermaltake stock and see what happens. Maybe do some research on the difference between the 2 also.
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post #4 of 9
Quote:
Originally Posted by bombastinator View Post

ive been told that what matters most is the ability to produce air pressure over actual CFM This is why preferred water cooling fans are different from preferred air cooling fans.

Correct. What you want to look for is static pressure. radiators provide a good amount of air resistance so a fan may have a high CFM rating but when placed in front of a radiator, The CFM can drop drastically. I higher static pressure means that fan can better retain its air flow even when faced with the resistance of a radiator.
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HAL
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post #5 of 9
this is why the card makers like centrifugal fans for hair dryer style cards. They produce lots of static pressure.

Edited by bombastinator - 10/18/13 at 10:50pm
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CPUMotherboardGraphicsRAM
4770k some mid range asrock. extreme 4 maybe? 2x gigabyte windforce 7950 2 x 8 corsair balistix sport 
Hard DriveOptical DriveCoolingOS
crucial ct960 LG blu-ray used venamous x win 8.1 pro 
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Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
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came with the cheapass keyboard who cares? some $30 no name 2+sub speakers I bought at mic... 
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New gaming rig
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CPUMotherboardGraphicsRAM
4770k some mid range asrock. extreme 4 maybe? 2x gigabyte windforce 7950 2 x 8 corsair balistix sport 
Hard DriveOptical DriveCoolingOS
crucial ct960 LG blu-ray used venamous x win 8.1 pro 
MonitorKeyboardPowerCase
Crossover 30Q5 PRO 30" 2560X1600  cheapest piece of crud I could find antec HCG 750 some thermaltake microcenter blue-light-special... 
MouseMouse PadAudio
came with the cheapass keyboard who cares? some $30 no name 2+sub speakers I bought at mic... 
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post #6 of 9
Static pressure is king in pushing air through radiators. Fans with high CFM will see their flow drop like a rock if it doesn't have the pressure to push through the deep fins of a radiator.
post #7 of 9
Thread Starter 
OK, I get it. So are there any recommendations for some good fans I could use for this setup?
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post #8 of 9
The Noctua NF-F12's are really awesome fans, some of the best you can buy for radiators and really quiet too. Expensive though.
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post #9 of 9
HAL
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2 X 480GB Samsung 840 EVO (raid 0) CPU: MCP655, XSPC 360 Rad, MIPS Iceforce HF GPUs: MCP655, external 360 p/p, EK 970 acx full... Windows 10 
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HAL
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