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Radiator size for silence

post #1 of 10
Thread Starter 
So I will be water cooling a 6950x and 2 titan x pascal. I will not overclock. My case is fractal design define S. I will be using hardwarelabs GTS radiators and noctua fans.My goal is to keep everything under 80 degrees C without going any higher.I can think of two options. First one is using two 360 radiators with fan at 800rpm maximum. Or use a 360 and a 140 radiator with moduvent on top, which should cover some noise, with fan at 1200rpm maximum. Which one should be more silent?...
post #2 of 10
Thread Starter 
and can both of these options keep everything under 80 degrees c with the fan speed I mentioned?
post #3 of 10
Yes a 360 rad is sufficient for you to cool everything under 80C and silence but you should add another 360 to keep water temperature under 50C so that your pump can last longer. So i suggest 2 thin 360 rad and low rpm fan ( 700-850 rpm) will do the job.
post #4 of 10
Thread Starter 
Quote:
Originally Posted by spyui View Post

Yes a 360 rad is sufficient for you to cool everything under 80C and silence but you should add another 360 to keep water temperature under 50C so that your pump can last longer. So i suggest 2 thin 360 rad and low rpm fan ( 700-850 rpm) will do the job.
so would you say 2 thin 360 rad with low rpm fans can be cooler and quieter than one 360mm with moduvent?
post #5 of 10
Quote:
Originally Posted by maxirona View Post

so would you say 2 thin 360 rad with low rpm fans can be cooler and quieter than one 360mm with moduvent?

Yes, with more radiator surface , you can run lower speed fan and still get the good temp.
post #6 of 10
Here are some links to many detailed reviews on which radiators (in various sizes) perform the best with low speed fans. They are from fellow forum members too biggrin.gif

http://thermalbench.com

http://www.xtremerigs.net
post #7 of 10
This is going to be one hot running loop.
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The Hive
(30 items)
 
HTPC Rig
(21 items)
 
 
CPUMotherboardGraphicsGraphics
i7-6800K Asus Rampage V Edition 10 Galax 980 Ti Hall of Fame Galax 980 Ti Hall of Fame 
GraphicsRAMHard DriveHard Drive
Galax 980 Ti Hall of Fame Special Edition Corsair Dominator Platinum Blac... OCZ SSD Crucial SSD 
CoolingCoolingCoolingCooling
EK Supremacy Evo Nickel Plated CPU Block Silverstone AP182 180mm Fans and Grills Various Custom Loop Parts Mayhems X1 Coolant 
CoolingCoolingCoolingCooling
Reeven Six Eyes II Fan Controllers GELID GC Extreme and Fujipoly Pads Bitspower Hall of Fame Waterblocks and Backplates Hardware Labs Nemesis GTX 560mm Radiator 
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Corsair SP120 PWM Corsair AF140 Windows 10 Home ASUS ROG SWIFT PG278Q 
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post #8 of 10
If you're okay with 80C on water, then that setup should be fine
post #9 of 10
You are asking a lot of even two gts 360 here. What are your ambient temps? Without overclocking, you're looking at about 650w heat load. each 360gts will dissipate 190w per 10c water delta at 750rpm.

So 2 of them at 800rpm will cool roughly 385w or so at 10c. Which means that at 650w, you will be looking at close to 20c water delta. If your ambient is under 25c, it could be ok. Over 25c, it may cause issue with the pump, which should stay under 50c.

Two 360 at 800rpm will cool better and be quieter than a 360 and 140. Two 360gts and two gpu blocks and a cpu block may give enough restriction to warrant a second pump if you want to keep pump speed low for no noise, so something to think about.
Edited by EMUracing - 4/26/17 at 10:56pm
post #10 of 10
I think 2x360 will be fine, by my estimates your water delta will be 15-20 C over ambient and cpu/gpu temps will be perfectly fine considering no OC planned. D5 and DDC pumps are rated for max 60 C coolant temp anyway. Should use a heatsink on a DDC though.

I do not recommend front 360 and rear 140 in Define S for silence as I did that before and IMO the noise from the back fan will travel out the same or more than having fans at the top (specifically if you have the back near a wall which bounces the sound back towards you).

Also make sure to use proper fans for the rads such as Gentle Typhoon (the fan used on xtremerigs rad reviews) or Corsair ML series etc. Thermalbench.com as linked above does great fan reviews if you want to see how different fans stack up.
Edited by r9miner - 4/27/17 at 12:15am
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