Adequate CFM for radiator?

[Safeway]

I have about 10 fans that I am testing right now.

There are 3 that came with the rad that are pretty damn loud and move alot of air - 81 cfm at 38 dB. Also, it seems like these ADDA fans don't control too well at low RPM and have a bummp bass noise to them - its nothing too bad, but it is noticable.

I also have 3 Antec low-speed fans that do about 39 cfm at 25dB

My question is, are 3 of these 39 cfm fans adequate to cool a CPU/GPU on a triple rad? I honestly don't know. If it wouldn't be enough, could I do a push/pull with the 3 Antec and the 3 ADDA slowed down and get good cooling results?

Thanks for the help.

 

[scrawnypaleguy]

Dude a triple 120mm radiator? Three of those low speed antecs would be plenty. Just out of curiosity, what case are you using that you can fit a triple radiator in it? Or is it modified?

 

[Mrvile]

AddA fans? You only get those with Lian-Li cases...and the ones that came with my V1000 are pretty quiet (I use one for the rad and one in the blowhole). My single 120x38cm BIX with an AddA cools my CPU and vid card adequately.

 

[Safeway]

Originally posted by: Mrvile
AddA fans? You only get those with Lian-Li cases...and the ones that came with my V1000 are pretty quiet (I use one for the rad and one in the blowhole). My single 120x38cm BIX with an AddA cools my CPU and vid card adequately.

What's the model of the fan? These are "ADDA AD1212MS-A71GL 81cfm 2050rpm 38dB(A)" fans - as taken from SPCR. From the looks of it, the MS stands for Medium Speed (Since there is also L(ow)S, H(igh)S, and U(ltra)S fans). Maybe once I build the enclosure, or set the case down, it would seem quieter.

So questions are still:

Would 3 40cfm fans in a pull config work?
Would 6 40cfm fans in a push/pull config work?

Thanks.

-Safe

 

[Mrvile]

Hmm...I can't look at my fans right now (they're both in use) but iirc they're both 66cfm @ 34dBA, or something like that. What are you cooling? I bet 3 40cfm fans in pull would work.

 

[Safeway]

I see these ADDA fans:

AD1212LS-A71GL 72cfm 1800rpm 34dB(A)

I'm cooling a P4 Northwood (nice and cool to begin with) but O/Ced - and a 6800GT as well. If you have 66 - 72 cfm going through your single rad, then 120ish cfm through a triple rad should be okay. Otherwise, I will just add 3 more fans and do a push/pull.

 

[Mrvile]

Well, I hate to tell you this but you're doing it all wrong

When you do this kind of stuff, a lot of it is trial and error. What I would do is strap on three fans, set them as low as they go, and check my temps. If they are a bit high for my liking, raise the fan speeds a bit. If it gets too loud, lower them and add the other three fans on the opposite side. Etc.

You gotta play with it a little. The best way to know what setup is right for you is through experience.

 

[Safeway]

I was able to do some tests with the case on the floor and the three ADDA fans at maybe ... 9-10V and pushing what feels like 55-60 cfm ... is just fine noise-wise.

So in all, 165 - 180 cfm in a triple rad, all pulling. That's seems like it's enough.

(On a side note, the rheobus that I am using in an Enermax 2 channel, and the resistors or capacitors or something in the back is getting extremely hot. There are no heatsinks at all - this is one reason that I am ordering 2 Vantec Nexus 3.5" fan controllers. I'll mount one up top with the rad and fans to minimize wire clutter in the case, and one like normal to control 2 120mm fans inside.)

 

[Safeway]

Originally posted by: Mrvile
Well, I hate to tell you this but you're doing it all wrong

When you do this kind of stuff, a lot of it is trial and error. What I would do is strap on three fans, set them as low as they go, and check my temps. If they are a bit high for my liking, raise the fan speeds a bit. If it gets too loud, lower them and add the other three fans on the opposite side. Etc.

You gotta play with it a little. The best way to know what setup is right for you is through experience.

I would do that, but the pump I recieved was DOA - so I am waiting for a replacement. In the mean time, I am going to finish everything else. So I can't actually check temps.

 

[Mrvile]

Originally posted by: Safeway

Originally posted by: Mrvile
Well, I hate to tell you this but you're doing it all wrong

When you do this kind of stuff, a lot of it is trial and error. What I would do is strap on three fans, set them as low as they go, and check my temps. If they are a bit high for my liking, raise the fan speeds a bit. If it gets too loud, lower them and add the other three fans on the opposite side. Etc.

You gotta play with it a little. The best way to know what setup is right for you is through experience.

I would do that, but the pump I recieved was DOA - so I am waiting for a replacement. In the mean time, I am going to finish everything else. So I can't actually check temps.

That sucks.

Well just put three fans on lowest settings and leave it at that for now...I'm sure three 40cfm fans would do the job.

 

[Safeway]

I wish this part of the forum was more active.

 

[Mrvile]

Originally posted by: Safeway
I wish this part of the forum was more active.

True dat...I spend most of my forum time in OT, but the rest goes to C&C and GH. I'm a big C&C fan (haha, pun!), it's easy to understand and I like physical hardware over stuff like video and overclocking.

 

[Safeway]

Well, like I posted above, the Enermax fan controller has components on board that are REALLY hot.

I just took a thermal probe on the Enermax to check its own temperature, and it quickly jumped from 74F to 175F to 198F to HHH - for Hot Hot Hot I suppose. This is 90-100C!!!

Is it okay for these two small components to get this hot?!

 

[NINaudio]

Originally posted by: Mrvile
AddA fans? You only get those with Lian-Li cases...and the ones that came with my V1000 are pretty quiet (I use one for the rad and one in the blowhole). My single 120x38cm BIX with an AddA cools my CPU and vid card adequately.

What are your idle/load temps? I have a BIX with two Antec Pro fans on it in push/pull config and was wondering if I could do better with some different fans.

You guys are right, this forum doesn't see enough action. I spend my time here and in the cpu/processor forums mostly.

 

[Safeway]

Well I'm looking to change that - and I can't do it single handedly. HardForum, and the other giants, get the most action when it comes to technicalities, but as such, they get alot of noobs.

As for my idle/load temps - my pump arrived broken and I am waiting for an RMA, so there are no temps available right now. I will post new info as soon as I can. The Antec Pro fans seem okay, but as long as these ADDA perform, I won't be changing.

I wonder what would happen if I had 50-60 cfm in the pull fans but only 40 cfm in the push fans. I wonder if it would help at all - that's something I will have to test.

 

[Mrvile]

Originally posted by: NINaudio

Originally posted by: Mrvile
AddA fans? You only get those with Lian-Li cases...and the ones that came with my V1000 are pretty quiet (I use one for the rad and one in the blowhole). My single 120x38cm BIX with an AddA cools my CPU and vid card adequately.

What are your idle/load temps? I have a BIX with two Antec Pro fans on it in push/pull config and was wondering if I could do better with some different fans.

You guys are right, this forum doesn't see enough action. I spend my time here and in the cpu/processor forums mostly.

Remember, nothing of mine is overclocked.

Anyway CPU is 29idle, 35 with Prime95, GPU is 49 idle, 54 load with RTHDRIBL.

 

[NINaudio]

Originally posted by: Mrvile

Remember, nothing of mine is overclocked.

Anyway CPU is 29idle, 35 with Prime95, GPU is 49 idle, 54 load with RTHDRIBL.

Wow...I guess I'm doing alright with the Antec fans then! My idle/load temps are 29-30/41-42 for the cpu, and 43-44/46-47 for the gpu. (prime 95/rthdribl). And that is with both being oc'ed......

 

[Safeway]

Originally posted by: NINaudio

Originally posted by: Mrvile

Remember, nothing of mine is overclocked.

Anyway CPU is 29idle, 35 with Prime95, GPU is 49 idle, 54 load with RTHDRIBL.

Wow...I guess I'm doing alright with the Antec fans then! My idle/load temps are 29-30/41-42 for the cpu, and 43-44/46-47 for the gpu. (prime 95/rthdribl). And that is with both being oc'ed......

Antec PROs are not too shabby. I happen to have the really shoddy, ultra silent variants that are almost inaudible and move roughly 40 cfm.

 

[NINaudio]

Yeah, the specs are pretty good on the pro's, I was just a bit worried because they don't seem to deal well with pressure, but I think by using a push/pull configuration I should be fine.

 

[mindwreck]

from what i've read. you usually want about 100 cfms for modern computers.
i have 2 evercool alu fans at ~6-7V on a dual heatercore and i get 41-43C load temp

with 3 fans you should be able to run things very low and still get good results

 

[Safeway]

Originally posted by: mindwreck
from what i've read. you usually want about 100 cfms for modern computers.
i have 2 evercool alu fans at ~6-7V on a dual heatercore and i get 41-43C load temp

with 3 fans you should be able to run things very low and still get good results

Thanks for the reply.