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Airflow Questions on Corsair 900D build with 3 radiators

post #1 of 12
Thread Starter 
Hi guys, this is my first posting in OCN.

I have been using WC setup for around 6 months. Currently in ATCS 840, I have one 360mmX60mm radiator for CPU + 2 GPUs + MB VRM.

I plan to upgrade with upcoming Corsair 900D. As this monster case allows multiple radiators without modding, I'm thinking of adding two more radiators on the bottom. (Alphacool XT45 480 + 240)

Below is the setup I'm thinking right now.



My question is about the airflow. In principle, pulling fresh air outside of the case towards radiator is the way to go as far as I know. However, with 3 radiators, I'm not sure whether it's good idea to put all radiators intake setup. I guess there's enough room between bottom and top so that the heat from the bottom doesn't affect the top much.

Compared to this setup, what do you think of making all rad fans intake and non-rad fans exhaust?
post #2 of 12
I find that 240 rad pretty pointless for what your cooling. I would replace it for just pure air intake fans.

Since heat rises I have always had top exhaust and if your rpelace that 240 on bottom with intakes you could have cold air blowing to 50% of the 480 blowing out.
Edited by iMica - 2/10/13 at 7:53pm
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by iMica View Post

I find that 240 rad pretty pointless for what your cooling. I would replace it for just pure air intake fans.

Since heat rises I have always had top exhaust and if your rpelace that 240 on bottom with intakes you could have cold air blowing to 50% of the 480 blowing out.

I already ordered every part frown.gif I know that adding 240mm on top of 480mm is kind of overkill, but couldn't it be helpful if I want to set fans at low rpm?
Edited by Whalemeal - 2/10/13 at 8:08pm
post #4 of 12
Quote:
Originally Posted by Whalemeal View Post

I already ordered every part frown.gif I know that adding 240mm on top of 480mm is kind of overkill, but couldn't it be helpful if I want to set fans at low rpm?

your temps will actually be worse as you will get too much heat dump in the bottom of your case. Trust me as myself and many others have done the same thing and unfortunately as your loop heats up too much heat will be placed in the bottom of your case, causing the intake temps for the radiators to rise.

I would go with something like an Alphacool UT60 down the bottom and just put a couple of exhausting fans there rather than a 240 rad.
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by trippinonprozac View Post

your temps will actually be worse as you will get too much heat dump in the bottom of your case. Trust me as myself and many others have done the same thing and unfortunately as your loop heats up too much heat will be placed in the bottom of your case, causing the intake temps for the radiators to rise.

I would go with something like an Alphacool UT60 down the bottom and just put a couple of exhausting fans there rather than a 240 rad.

i read your recent build log and found your own expreience on this. Impressive work btw.

I wonder if 3x120mm front fans in 900d make things different than your case.
post #6 of 12
Quote:
Originally Posted by Whalemeal View Post

i read your recent build log and found your own expreience on this. Impressive work btw.

I wonder if 3x120mm front fans in 900d make things different than your case.

Whale, with the stacked method of the 480 at the bottom + a 240mm, you'll have more cooling capacity than with just a single 480. Now if you're only running a 3770K with 2-3 low TDP cards, two 480 rads in push pull would be more than enough. You'll have lower efficiency on the 240mm, and have a tad higher idle water temps, but when under load with high heat load, you'll actually have more heat dissipation than just with two 480 rads if this makes sense. Thus having lower overall load temps compared to just with two 480 rads.


Something else to consider is have the 240mm pushing air into the chassis as well, as well as the 480mm pushing air into the chassis. Have additional front intake fans, and a large 140mm exhaust, then have the top 480 pushing air into the chassis. Only downside to this is that your overall case temp will be higher, but if all your components are under water, they will actually have lower temps, as your rads are getting fresh air. The extra benefit is positive air pressure, so no dust!
Edited by cookiesowns - 2/11/13 at 12:26am
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post #7 of 12
Quote:
Originally Posted by Whalemeal View Post

i read your recent build log and found your own expreience on this. Impressive work btw.

I wonder if 3x120mm front fans in 900d make things different than your case.

It would help mate, no doubt about it... you just have to remember that at load, the warm air has to go somewhere.

It can have a large negative effect if 1. your hot air is going through a radiator to exit the case OR 2. you are pumping it all internally as like cookiesown said, your components will all heat up a lot more.
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by cookiesowns View Post


Something else to consider is have the 240mm pushing air into the chassis as well, as well as the 480mm pushing air into the chassis. Have additional front intake fans, and a large 140mm exhaust, then have the top 480 pushing air into the chassis. Only downside to this is that your overall case temp will be higher, but if all your components are under water, they will actually have lower temps, as your rads are getting fresh air. The extra benefit is positive air pressure, so no dust!

Thanks for the advice!! I will definitely consider this setup seriously. I also think that all-pull setup makes sense in terms of ambient-water delta. But will a single rear 140mm fan enough for exhaust?
post #9 of 12
if you have 6 fans pulling air in through your rads then a single 140 to exhaust will not be efficient.
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post #10 of 12
Quote:
Originally Posted by Whalemeal View Post

Thanks for the advice!! I will definitely consider this setup seriously. I also think that all-pull setup makes sense in terms of ambient-water delta. But will a single rear 140mm fan enough for exhaust?
Quote:
Originally Posted by trippinonprozac View Post

if you have 6 fans pulling air in through your rads then a single 140 to exhaust will not be efficient.

It's not efficient, however, if he does not have anything else that's air cooled ( I hope so ) it should be fine! Plus the front intake will be cooling his HDD's/SSD's anyways. So I guess the word is, not efficient, but sufficient, given that you don't have any critical load that's air cooled.

Let me know which route you take, or when you're going to do this. I'm getting a 900D as well to move my current rig into!
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