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Radiator Types For Low CFM Fans...

post #1 of 10
Thread Starter 
I've been thinking the PA120.3 is the radiator I should get, with some medium speed fans. But those, with the pump, will probably give me a noisier system than my 5 SilenX fans (They're not AS bad as everyone thinks... ). How much performance loss are we talking if I go for a radiator built for low CFM fans, rather than the PA120.3, with some medium speed fans?
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post #2 of 10
Hmm... if you're going water cooling, may as well spring for the best you know? Unless noise is a problem. I have a Silverstone FM121 and the noise doesn't bother me at all so 6 of them in a push/pull wouldn't be too bad.

But screw Silverstones. Yate Loons for the win!
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post #3 of 10
Go bigger. You can get a quad-heater core for around 100-120$ the larger the element the better the dissipation.
post #4 of 10
On JabTech you can find the Loons for about $4 a pop. Hard to beat that--they run between 6.5-13.8 Volts.

But honestly the ThermoChill PA line is the best for low cfm--you are on the right track. The SilenX do not appear to have enough pressure characteristic for High CFM rads, put for the PA I can personally attest that a single SIlenX 72cfm 14 dba LED fan attached to a PA 160 with the shroud prvoded with the rad kept my E6300/P5K at 47C @ 3.1 OC at 100% load while Folding--the results are in my P5K3 Review thread if you are interested and the Test Bed is detailed in my Lian Li Test Station thread.

Rather than guess I test.

I also found that if I used a fan mate type single fan controller and ran the fan as low as it would go without stopping altogether that I got 54C A 100% Load @ 3.1 OC on the E6300.

This again is a single fan at inaudible speed on a PA160--an actual test--not a guess.

Sometime in the next day or so I will be load testing a Q6600 on a P5K3Deluxe on the exact same test bed.

The Loop is a DB-1 pump (inaudible) D-Tek FuZion WaterBlock (low restriction) and PA 160 with one fan in a pull configuration.

In my experience with the Silenx they perform best in a pull config and I don't know why.

SO in short if you had the room a PA160 outperforms the PA 120.2 in some applicationss according to the blurb from ThermoChill.

For a truly silent cooling ssytem the best you could hope for is one fan maybe two.
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post #5 of 10
Yeah for silence its hard to beat the PA rads...If you didn't mind noise so much I would suggest the GTX 480 with some 70+ cfm fans for that quad-core...I have a 320W Pelt and a heavily OC'ed Opty and it doesn't even come close to putting a load on mine....
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post #6 of 10
The fans volume have a fairly significant impact on thermal performance, it's something in the neighborhood of 50% less fan volume is 40-45% less performance. Here is swiftech MCR220 for example:



The top lines are with 162cfm total (81 each) air flow, middle is 95 (47cfm ea), and the lowest is 67cfm (34cfm ea).

So at an assumed 1.5 gal/min, you could dissipate 300 watts at 162 cfm, and 150 watts at 67cfm.

So it's not a linear relationship there is a curve to it, but you loose about 50% of the performance when you cut the airflow by 60%.

Here is thermochills graphs,
http://www.thermochill.com/PATesting...lowrateGPM.jpg
note they are using different fans so you can't compare apples to apples, but in regards to fan speed you'll see a similar relationships...the PF is 100cfm panaflows, 12m are 73cfm deltas. The important point to note is that at 1.5 gpm at 12v panaflows 400 watts dissipated, and at 7v, you get 270 watts: So cutting the voltage down by 40%, you get about 35% loss in performance so it's very similar.


Bottom line is running low cfm fans means you better add some radiator capacity because you may only be getting half the performance out of it. Or if noise is not a concern, using some 100cfm fans will provide you quite a bit more performance with less radiator if you need it. My preference is less fan and more radiator for less noise, but it's a balance on what heat you're dissipating, the radiator space you have, your budget, and your noise preferences.

Also as already noted, some radiators are better for high cfm fans, and some are better at low cfm. The thermochills are king in the low cfm market (you pay for it thought), or something more budget oriented like the swiftech mcr series, HW BIP or GTS are also good low speed rads. Something like the HW GTX series need some strong high speed high pressure fans to get the most out of it. I've heard heat cores also need some good fans to push through them well.
    
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post #7 of 10
Thread Starter 
Thanks for all the input guys

Noise is definitely an issue (I sleep about 2 feet from my computer), so the larger radiator/less fan thing is what I'm aiming for if there isn't a huge performance gap.

So, does anyone have any ideas on what fan/radiator configuration I should go with?

And on one other note: how do you tell what voltage you're running fans at? Do you need one of those impeders in order to lower the voltage on a fan?
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post #8 of 10
A PA120.3 is probably the best performing if price is not an issue. The rest of the budget rads are fairly close in performance.

As far as performance difference, here is an MCR320 against a PA120.2 with yate loons. Roughly the same performance of a low cost triple rad vs the PA120.2.


Now flip that around and look at performance/dollar.
PA120.2 = $120
http://www.dangerden.com/store/produ...4&cat=5&page=1

MCR320 = $49
http://www.sidewindercomputers.com/swmcqupo3xbl.html

While the PA120.2 can do roughly the same performance with one less fan and therefore slightly less noise, and with less space, you pay about 2.4 times as much. The thermochill is also very slighly less restrictive, something like .3psi drop at 1.5gal/min vs .5psi.

In the end, the question comes down to budget and space.
    
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post #9 of 10
These fans are pretty quiet but will still have good air pressure..Use a shroud and a pull configuration with the fans to get the most out of them...

....http://www.svc.com/fba12g12l1bx.html
Panaflo Fan w/ RPM 68.9CFM 30dBA


Thermochill PA.3 for top end...


GTS 360 for economy...
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post #10 of 10
Thread Starter 
Thanks again for all the help! I think I'll go for the .3 with those Panaflo's
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