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Best Fans for Mo-ra3

post #1 of 7
Thread Starter 
Hi,

It has been a while since I started designing my new/first watercooling system. It is based on a MORA3 9x 140 radiator. I would appreciate your input on whether to use the noiseblocker Pk2 fans (1200RPM) or PK3 fans (1700rpm).

Am i gonna ever need 1700 rpm fans for this rad?

Price s the same for both fans

manual:
http://www.noiseblocker.de/Datenblae...40mm_de_en.pdf

Thanks!



.
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post #2 of 7
The PK3's are not a terrible option, but you'd want fans with a static pressure rating closer to 2mmH20 to effectively push air through the MORA 3, since it's got the increased fin density and the extra tube in it.

Those PK3's will be fine when it comes to quiet though. The only other option I can think of are Phobya Nano-G 14's which are 1.85mmH20 vs PK3's 1.75mmH20.
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post #3 of 7
Running my 9 140mm Yate-Loons at ~900 rpm gives me a 4.5c delta, running them at 1200ish rpm gives me 3.5c, specs in signature (no clue what their static pressure is...)

for me 900 rpm is loud enough but if you have a decent fancontroller, you can always buy higher rpm fans and turn them down right. I just got the YL because they were cheap and I'm happy with them, have 3 Noiseblockers for my case though and they're much better quality-wise
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Tator Tot View Post
The PK3's are not a terrible option, but you'd want fans with a static pressure rating closer to 2mmH20 to effectively push air through the MORA 3, since it's got the increased fin density and the extra tube in it.

Those PK3's will be fine when it comes to quiet though. The only other option I can think of are Phobya Nano-G 14's which are 1.85mmH20 vs PK3's 1.75mmH20.
Oh I see... Well I was mainly oriented towards the PK2 (1200rpm) due to the review of bundymania here:
http://www.overclock.net/water-cooli...ra-2-mora.html

According to this review, it seems that the mora3 is not giving that much benefit (temp wise) with higher rpm fans. Even with the 1200rpm fans I will have probably to adjust these to work at 800rpm.

Thanks for the input!
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by n0n44m View Post
Running my 9 140mm Yate-Loons at ~900 rpm gives me a 4.5c delta, running them at 1200ish rpm gives me 3.5c, specs in signature (no clue what their static pressure is...)

for me 900 rpm is loud enough but if you have a decent fancontroller, you can always buy higher rpm fans and turn them down right. I just got the YL because they were cheap and I'm happy with them, have 3 Noiseblockers for my case though and they're much better quality-wise
Thanks for the answer!

I am not an expert, but i believe that 1C difference in temp is not that important (is it?) If thats the case, then low rpm seems to be the optimum solution, efficiency vs noise?!

And of course I agree with you about the quality of the noiseblocker and thats the reason I would like to get these, but still these are expensive so I have to decide between PK2(1200RPM) and PK3 (1700RPM).

I believe that with a good fan controller I can adjust also the high rpm fans, BUT the thing is that "usually" the lower the voltage you use for the fans the greater the "whine" noise is and with the 1200rpm i will not have to reduce the voltage e.g to 5volts, but to 7volts.

Please correct me if i am thinking wrong?!
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post #6 of 7
It really depends on the fan if they give off noise from having the input voltage reduced. I've not heard of PK3's having that issue.
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post #7 of 7
I've got 4 of the PK2s. They're louder than GT1450s at full speed but they have a pleasant smooth sound which I like.

3 of them have slight motor noise at 5v but it's not as annoying as the whine of the newer GT1450s.

I'd take the claim of 20DBa with a pinch of salt though, maybe from 20' away?

Because they're sleeve bearing using them horizontally means they have a lot of bearing noise but they're fine in the vertical position.

They look very good quality and I like the fact that the fan connector is right next to the frame so you can either use one of the 2 different lengths of extension cables they supply with them to extend to a fan controller or plug them directly into a multi connector.
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