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Push/Pull vs High CFM Fan

post #1 of 23
Thread Starter 
I decided to make a thread about this since I'm sure a lot of people wonder the same this.

I have a RS240 rad with 3 fans (the RAM is in the way) push/pull. I'm bout to start watercooling the Radeon HD 6870's so I'm goin to add a rad to the loop. The loop will be Pump/RES, CPU, 120 Rad, GPU x2, 240 Rad, Pump/RES. I want all fans and rads inside the case for a nice clean look. I using a IN WIN Dragon Rider with a Full ATX mobo.

Now that you guys got all the info, here's is where the question and problem is. If I put 4 120x25mm fans on the 240 rad, I can't put the rad in the case because of the RAM clips. Thats why I'm using 3 fans but now I'm bout to watercool my GPUs so I'm adding a extra Rad to help with the cooling. The problem is space, I'm putting the 120 rad where the "exhaust" fan goes and making the airflow go in the cast (don't worry, the case side is all mesh so the hot air has somewhere to go). The 120 rad is 29.6mm thick, if I go with a push/pull fan setup, it adds up to 79.6mm into my cast which doesn't look nice and loud(noise is not really a problem for me). So I trying the add just one high speed 150.33 CFM 120x25mm fan but will it hurt the performance or be bout the same as two 70-80 CFM fans? This question goes for the RS240 rad to. I know I've said a lot but I wanted to make sure you know everything you needed to know. Here is the rads and fans I have and thinking bout getting. If you need more info, fill free to ask. biggrin.gif

P.S. I'll be using a 30W per channel fan controller.

XSPC RS240 Dual 120mm Low Profile Radiator Rev 2. (own)

Yate Loon 120mm x 25mm (own 3/used on RS240)

Black Ice GT Stealth 120 Radiator (getting)

Delta 120 x 25mm Extreme High-Speed Fan (want to get for 120 rad)

x2 Delta 120 x 38mm High-Speed Fan (want to get for 240 rad)
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post #2 of 23
Performance with a single faster fan with much more static pressure should work better than two slower fans. When you use two fans in push/pull, that increases the static pressure but does not increase CFM. It makes it easier to get air through a dense radiator but kind of pointless in a less dense radiator made for slow speed fans. Your RS240 has a really low FPI (fins per inch) and is made mainly for low speed fans so having high speed fans will not give you much better performance. Also, using a single layer of high speed fans will be MUCH louder than the Yates in push/pull. Using push/pull instead of just push will add "body" to the sound but won't really add much volume. If space is an issue, then you don't need to do push/pull with your current radiator. The 4k rpm fans will improve performance slightly (less than you think since it's a small radiator with low fin count) at the cost of being many times louder.

EDIT: also, the 4k rpm fans are rated at nearly 30db louder than the Yates which means they'll be 8 (EIGHT) times louder with NO obstructions. They'll be even louder when attached to a radiator. What you have now may not bother you but...just fair warning.

And for the Black Ice GT you're thinking of getting, now those are made for high speed fans and 1800+ rpm fans are recommended.
Edited by Cha0s_Cha0 - 10/29/11 at 7:52pm
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post #3 of 23
Thread Starter 
Thanks ChaOs_ChaO, So if I want to go with a one lay fan setup, what would you recommend in terms of fan speed/fan noise. Once again fan noise not being a big issue, just dont want it super loud.
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post #4 of 23
Quote:
Originally Posted by Cha0s_Cha0;15504319 
EDIT: also, the 4k rpm fans are rated at nearly 30db louder than the Yates which means they'll be 8 (EIGHT) times louder with NO obstructions. They'll be even louder when attached to a radiator. What you have now may not bother you but...just fair warning.

This. Most people fail to realize that the db scale is not linear.
    
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post #5 of 23
If you don't want it to be super loud, I'd recommend slower fans. I'm using Cooler Master R4's in push/pull (they're 2k rpm) and work very well with 30fpi. Also, it's hard to beat their price/performance (less than $8 each on amazon but the price fluctuates often) They are going to be MUCH less loud than those 4k rpm fans and have very good static pressure especially if price is a concern. Though I would recommend getting the same type of radiator for the entire system since sound level and performance levels won't be even.

ie. having a dense radiator along with a less dense radiator will ruin the benefits of low speed fans on the less dense one because the dense radiator will be loud with high speed fans. Also there's no need to have a dense radiator to cool well then add in a less dense radiator to the same loop that doesn't perform as well.

To save money, I'd recommend getting a second rad that is also has a low fin density and just remove a fan from your 240 and put it on the low density 120. Or you could even order an extra fan to make the 240 push and the 120 in push/pull.
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post #6 of 23
Thread Starter 
Quote:
To save money, I'd recommend getting a second rad that is also has a low fin density and just remove a fan from your 240 and put it on the low density 120. Or you could even order an extra fan to make the 240 push and the 120 in push/pull.

The only problem with push/pull on the 120 rad is the thickness. Do you think I could use 2 120x12mm (yes 120x12) 45CFM fans push/pull a 120 rad (low or high FPI?) and 2 120x25mm 70CFM push setup on the 240 rad? Would that cool OC'ed 4.0ghz 6 core and 2 HD 6870 with no problem?

P.S. with just the 3 fans on my 240 rad and CPU, it idles at 20c/max 35c/room temp 77f
Edited by truthordare - 10/29/11 at 8:24pm
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post #7 of 23
You don't need push/pull on your current 240 rad since it's only 8fpi so keeping it with 3 fans is fine but that third fan isn't really necessary. The fan that would work well with the 120 will depend on if you get that Black Ice rad or a lower density rad at around 8-10fpi like your current rad. If you get the Black Ice, I can recommend R4's as per above which are still fairly quiet and perform very well. I have a koolance 30fpi rad and the noise doesn't bother me using the R4's. If you don't want that and choose a 8-10fpi rad then you can just move your third fan down to the 120
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post #8 of 23
Thread Starter 
Quote:
If you don't want that and choose a 8-10fpi rad then you can just move your third fan down to the 120

So no push/pull low FPI 120 rad with no push/pull low FPI 240 rad will work fine with CPU and 2 GPU?
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post #9 of 23
Thread Starter 
Here's a random quick question, Should I watercool my mobo NB? Its very hot to the touch.
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post #10 of 23
def agree w cha0s (30fpi ftw). if you can afford to WC it and you want to OC a lot then yea. if not, then a mini fan or ram cooler might help.
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