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Calculate cooling capacity - Is this total wrong ?

post #1 of 7
Thread Starter 
Hi

Is trying to find out how much cooling capacity that I can fit in my case, and would like to hear if this i total wrong.

The rads I will be using is 3x:

Alphacool XT45 280mm
http://www.aquatuning.de/product_info.php/language/en/info/p12884_Alphacool-NexXxoS-XT45-Full-Copper-280mm.html



My problem is that I cant find a test of the 280mm ...

14x14x2 = 392 cm2
12*12*3 = 432 cm2

So the 280mm got "almost" the same front area as a 360mm, so is looking at this review:

http://martinsliquidlab.org/2012/04/15/alphacool-nexxxos-xt45-360-radiator/5/



With ~1000 rpm it can dissipate 149 Watt ... So if I am using 3x rads:

3 x 149 = 447 Watt

And since the 280mm is a bit smaller, then I think about 400 Watt is right ? .... I will also use Push/Pull and in the review, I can see what is should perform about ~30% better than just using Push ... So it will look something like this:

400 x 1.3 = 520 Watt

How does this look - Am I total wrong ?

Regards Fonne

(Hope the English is decent)
post #2 of 7
I'll just share my experience. Take from it what you will.

I was never able to get better temps with a 280 rad over the 240 I had replaced it with (huge mistake) thinking I would see an improvement. I went through trying several sets of 140mm fans recommended to me here at OCN (blacksilent pro 140s, Aerocool shark 140s, and Noctua A14s) in push-pull and the only way I was able to get anywhere near as good of temps as had been getting using NB eLoops or GT AP-14s or even sickleflows in push-pull on my 240 was if I ran them at full blast 100%, something I almost never did with 120 fans, and the 140s were all waaaay louder than the 120 fans.

It's not due to the rads, as yes, the 140 offer increased surface area, but it's the fans that matter. 140mm fans do not compare well against 120mm fans when it comes to what counts - silence and static pressure - when up against a rad. Some of the 140mm fans I tried look like they would do much better on paper than in actual practice. It ruined me for 140mm rads. I won't go back unless there's a HUGE breakthrough in 140mm fan design.

There are more than a few here that will argue the 140 rads are better thanks to increased surface area and the fan motor housing on a 140mm fan takes up a smaller percentage of space to a 120mm and blah blah blah. I'll never fall for any of that nonsense again. I've tried both in the same computer with no other changes made, and at least in my experience it just does not work that way.
Edited by Unicr0nhunter - 12/2/13 at 11:42am
post #3 of 7
I on other hand only use 140mm+ radiators now. Fans are indeed iffy but there are a few decent ones out there. I use 120mm eLoops or GTs on 140mm radiators w/ adapters when I can. But I've also had great luck w/ 140mm medium speed Yate Loons. They motors on the 140mm are significantly larger than 120mm YLs. I run mine @ around 6V, which is very quiet. They are significantly more powerful than the 140mm Bitfenix, Swiftech, and Gelid 140mm fans I have also tried. I guess I should add that all my radiators have a very low FPI, from 7-9.
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Big Lian Li
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post #4 of 7
Thread Starter 
I will think about using 120mm RADS because of the better fans, but is really hoping to see some nice fans here in the beginning of 2014 - We have waited soo long already, and got great RADS on the marked.

But is my calculation total wrong ?
post #5 of 7
Thread Starter 
Has been looking over the number again, and think it looks pretty right ? ... So with 1000 rpm fans I can dissipate around ~500 Watt and with 2200 rpm fans it will double to around ~1000 Watt.

Are my number correct ?
post #6 of 7
your math is close enough.

And from other post I see you will have an OCed 4770k and 2 x 670 OCed in sli. With 6 x 140 rad equivalent you could easily run tri sli 670's.

Running prime to stress cpu, your OCed cpu + both gpus at idle + pump will be 250W or less. your delta air to water would be less than 5C, even with 1700 rpm fan speeds, even with rads inside case.

Gaming, the cpu nor both gpus ever fully loaded, and you can run fans at 1000 rpms, be quiet and have good cooling with 6x140 rads or 6x120 rads.

Though your OCed 4770k may run hot, but it wont be because of rads and fans, as your delta air to water will be good.
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post #7 of 7
Thread Starter 
Thanks thumb.gif

Right now I am only running with a 4770k and a single GTX670 - But is looking after one more to run SLI, or else I will upgrade to a single GTX780 ...

The plan was to have a silent system and only 1000 rpm fans or less, so great to hear it will work fine smile.gif
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