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Fluid dynamics / heat transfer Gurus: Is a 360mm really better than a 280mm radiator? (mathematically yes, but...)

post #1 of 4
Thread Starter 
I am planning to put a AIO radiator for X99 i7-5960x build (Thermaltake Versa H34). I have only one Gfx card (Asus Geforce 680) and a PCIE SSD and no HDD and no 2.5" SDD

Two choices:
#1. FRONT: Corsair H115i 280mm 26mm thick radiator w/ 2x140mm Fans in Push-Pull config intake from front.
#2. FRONT: Thermaltake Water 3.0 ultimate 360mm 27mm radiator w/ 3x120mm Fans in Push-Pull config intake from front.
TOP: In BOTH the config 2x140mm fans as exhaust.

(Yes I could have 2 or 3 fans on the top depending on #1 or #2 but for 1st order comparison purpose I will stick with 2x140mm Exhaust)

Now, yes #2 which is 360mm has a total area of (neglecting 1mm diff in thickness) 43200Sqmm area and #1 has only 39,200Sqmm area.

The #2 setup with 360mm rad has about 10% more area; THAT IS IT.

Not going into fin-density and static pressure analysis; comparing area alone the diff is only 10% and I need 2 more fans (not a big deal) but this means more db even if i run them at 10% slower?

Can some one (any fluid mechanics guy here?) comment on how this 10% will affect the over-all performance of the system? esp at say 10% 25% 50% 755 and full TDP load of 140W?

Does difference in performance translate linearly down as the load decreases and does it linearly decrease as the fan speed reduces (assume all six fans are connected to same PWM control).

I know the cross sectional area even though is only 10% diff I think the 360mm may have bigger advantage? or vice versa?

Now, just for giggles, add some more complication:

With #2 the 360mm I can only put 2x140 on the top as exhaust on the other hand with #1 the 280mm radiator i can add 3x120mm on the top as exhaust.
post #2 of 4
Simply put.....take the money you would be spending on one of these CLCs, then take part of the money you would be wasting on fans to put a slim aluminum rad in push/pull, and simply buy a much better cooler like the Swiftech H240-X2. Same money, far lower noise, much better performance and much better looks. Kind of a no brainer.
post #3 of 4
If you look at the number of posts from people asking what fans they should replace the stock ones on the Corsair units with, you should realize that it's best to just get something like the Swiftech units to begin with.

In general, a 360 will outperform a 280 of the same design.
Edited by Jidonsu - 2/28/16 at 7:55pm
Black Fury
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Intel Core i7-4790K Asus Z97A/USB 3.1 EVGA GTX 980 TI FTW ACX 2.0+ Kingston HyperX Fury Black  
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Black Fury
(19 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core i7-4790K Asus Z97A/USB 3.1 EVGA GTX 980 TI FTW ACX 2.0+ Kingston HyperX Fury Black  
Hard DriveHard DriveHard DriveHard Drive
Samsung 850 Pro 512GB - OS  Mushkin Enhanced Reactor 1TB - Steam Library an... Toshiba X300 5TB - Photography Seagate Barracuda 4TB - Photography Backup 
CoolingOSMonitorKeyboard
Custom Watercooled Windows 10 Dell U2715H Corsair K70 
PowerCaseMouseAudio
EVGA 850W G2 Fractal Design Define S Logitech G502 Sennheiser HD 650 
AudioAudioAudio
Bottlehead Crack with Speedball Matrix Mini-i DAC JBL LSR305 
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Reply
post #4 of 4
Thread Starter 
ciarlatano & Jidonsu: thanks for the obvious answer; copper/Bass low fin density, high flow rate... but No thx.
I have problems with H-240X mounting on the top. I can't. I have to do it on the front vertically which is not a very good idea for H240X. Also I am looking for long years of maintenance free operation at least 5 years. The only thing I want to do is remove the front dust cover and wash and vacuum the radiator fins from the front. All these are Not possible with Swifttech H240x.
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