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High density RAD vs Low with AP-14 Push-Pull

post #1 of 4
Thread Starter 
I am trying to figure out the difference between performance to noise ratio in high FPI vs the trend of Low FPI in most radiators today. It seems most company's are designing there rads with low FPI to better accommodate low to medium speed fans with less than stellar static pressure.

Most of the fans I own are Gentle Typhoon, AP-14 & AP-15's and a couple of PWM Helix's.

My question is as follows. If I were to use a Medium high - high FPI - QUAD RAD with AP-14's in push pull would this be sufficient in having enough static pressure and air flow while maintaining a quieter noise profile in comparison to using just a push setup with PWM AP-29(3000 RPM) that I could control the rpm level with and create a fan profile.

Or better yet would the AP-14 in push pull be better suited for a thick RAD using p/p and low fpi
Edited by Nightingale - 3/7/14 at 8:56pm
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post #2 of 4
Your questions confuse me.

By far, what matters most for performance is fresh air movement throught your rad. FPI count and rad thickness matter little next to nothing, especially below 2000 rpm. High FPI rads perform less than a low FPI one at slow speeds. For anything below 1500 rpm , even with GT fans, a low FPI rad performs best.

So I say go with low FPI rads such as the Alphacool line. And go as thick as possible while preserving push/pull.
If you don't want, or can't afford p/p, I'd stick to a slimmer rad in hopes to later upgrade to p/p.
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post #3 of 4
Thread Starter 
I apologize. I had written the post in an extreme state of fatigue.

So to recap and make sure I understand this correctly. Air movement is what is most important. High FPI rads only start to become more effective at dissipating heat when the fans are running at high rpm's, somewhere around 1850(ap-15) and up which is what I am not interested in. The two main types of low fpi rads are medium thickness and ultra thickness. The really thick rads with say AP-14's benefit the most with push pull config since they allow the air to pass through the longer depth of fins more quickly. Correct?
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post #4 of 4
Pretty much correct.
Except that low fpi rads come in.all thickness, including as thin as 30mm.
And just to show that thickness and fpi isn't alwaus where it's at here is something else for you:
A thin low fpi ead will actually perform BETTER than a thick one at low speeds.
For example, if you look in the following graph, the ST30, a 30mm thick very low fpi rad is the king at any speed below 1000 rpm.

And the GTX 360 very thick, very dense rad is the worst performer at slow speeds, but slowly starts to climb up. At 2200 rpm, it't not the king yet. I expect it to reach the top around 3000 rpm......very noisy fan speed.

The best performing rad over the widest range tested is certainly the UT60. A 60 mm thick low fpi (10 fpi think) rad, the ST30's big brother.

So again, I advise you go as thick as you can in low fpi while preserving push/pull for best performance below 2000 rpm.

Cheers biggrin.gif
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Dark Vader
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