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fans to mobo or case controller

post #1 of 5
Thread Starter 
I'm trying to build my first computer. I installed the water cooler. It's attached to the mobo. My corsair 780t has two front fans and a fan in the back. Should I connect those to the three fan headers on the mobo or should I connect them to the case fan controller? What benefit is there in using one or the other, or both? If I use the case fan controller, does anyone know where I can find easy to understand directions on how to do that? If I add another fan, is using a "splitter" for one of the mobo's fan headers the way I would connect a fourth fan (because my mobo only has three fan headers)?
post #2 of 5
Attach to the mobo headers with auto-control - your fans will speed up and slow down as you apply and remove load to your system. I find this annoying, as the volume of the fans increases and decreases very noticeably second by second, and can be distracting. A constant volume of operation is far easier to get use to and tune out/not notice.

Attach to the mobo headers with fixed speed - your fans will always run at the same speed no matter what. Find a speed that seems to keep the whole system acceptably cool no matter how much load (minimum might do the trick for a lot of systems for case fans).

Attach to the case fan controller for novelty - it can be novel at first to control the fans with the click of a button or the turn of a knob - but you will eventually settle on a fan speed that is a bearable volume and keeps the system cool, and probably never touch it again.

Attach to the case fan for extreme temp ranges - In australia, summer can be 40-45 degrees celcius, and winter can be about 10-15 degrees celcius. On a 45 degree day, the room your computer is in might get to 35/40 degrees easily if you don't have air-con. In this case, maybe being able to click a button, run your fans on full during summer, then when the days start getting cooler, click the button and bring them down to suit the ambient temps. (This is the only real use i can see to controlling case fan speeds with a controller).

At the end of the day, you might as well attach them to the fan controller, coz its there, if you were thinking of dropping $100 on a fan controller, i'd say don't bother, but if you have one built into the case, might as well use it and have that control at the click of the button, but as i said, youll probably find a speed that works and leave it set.


With the watercooler/radiator fans, attach it to mainboard fan headers and set it to fixed speed, probably min will do. (but try different speeds and note the performance of the loop). I find that in my loop, if i run the fans at max, or run them at min, it makes no real difference to the water temps, so might as well run on minimum so the machine is quiet.


And yes, for your 4th fan, use a splitter cable, just make sure it is 3pin to 3pin and not 3-pin to 2-pin like many cheap ones are (so you can get the RPM report of how fast the fans are spinning - so mainboard can tell if they fail)
Edited by anti-clockwize - 1/11/15 at 9:09pm
post #3 of 5
Thread Starter 
I am getting the Corsair AX1200i power supply. The PSU has something called Link that's supposed to enable controlling fan speeds. If I connect the fans to the front fan controller, and the front fan controller connects to the PSU via molix cable, will I be able to control the case fans with the Link software even though they are connected to the front fan controller?
post #4 of 5
Corsair Link is a software suite from Corsair that controls fans and such. The physical link is from your power supply to a USB header on your motherboard. Corsair also sells a mini control unit where you plug other Corsair Link branded components into the mini controller and from there to your motherboard.
Numenor
(25 items)
 
  
CPUMotherboardGraphicsGraphics
Core i5-3570K ASUS SABERTOOTH Z77 XFX AMD Radeon HD 7970 GHz HIS AMD R9 280X iPower IceQ X² Boost Clock 3GB 
RAMHard DriveCoolingCooling
G.SKILL Ripjaws Series 16GB (4 x 4GB) 240-Pin D... SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB  McMaster-Carr UV-Resistant Extruded Acrylic Rou... Heatkiller GPU-X³ 79X0 XFX Edition HD 7970/7950... 
CoolingCoolingCoolingCooling
Swiftech MCR220-XP Radiator Swiftech MCP655 Cougar CF-V12HPB Vortex 120 mm PWM fan Monsoon Series Two D5 Dual 5.25" Reservoir Blue 
CoolingCoolingCoolingCooling
PrimoChill 1/2" OD Ghost Compression Phanteks PH-F140XP-BK 140 mm PWM fan  Alphacool NexXxoS UT60 Full Copper Dual 140mm R... Aquacomputer Aquaero 5 LT 
OSMonitorKeyboardPower
Windows 10 Pro Yamakasi Catleap 2703 LED IPS 2560x1440 WQHD 27... KB Paradise 60% EVGA SuperNOVA 850 G2 220-G2-0850-XR 850W  
CaseMouseMouse PadAudio
Fractal Design Arc Midi ROCCAT Kone Pure ROCCAT Taito Mini-Size 3 mm Aune T1 DAC and Tube Amplifier 
Other
AKG K242 HD 
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Numenor
(25 items)
 
  
CPUMotherboardGraphicsGraphics
Core i5-3570K ASUS SABERTOOTH Z77 XFX AMD Radeon HD 7970 GHz HIS AMD R9 280X iPower IceQ X² Boost Clock 3GB 
RAMHard DriveCoolingCooling
G.SKILL Ripjaws Series 16GB (4 x 4GB) 240-Pin D... SAMSUNG 840 Pro Series MZ-7PD256BW 2.5" 256GB  McMaster-Carr UV-Resistant Extruded Acrylic Rou... Heatkiller GPU-X³ 79X0 XFX Edition HD 7970/7950... 
CoolingCoolingCoolingCooling
Swiftech MCR220-XP Radiator Swiftech MCP655 Cougar CF-V12HPB Vortex 120 mm PWM fan Monsoon Series Two D5 Dual 5.25" Reservoir Blue 
CoolingCoolingCoolingCooling
PrimoChill 1/2" OD Ghost Compression Phanteks PH-F140XP-BK 140 mm PWM fan  Alphacool NexXxoS UT60 Full Copper Dual 140mm R... Aquacomputer Aquaero 5 LT 
OSMonitorKeyboardPower
Windows 10 Pro Yamakasi Catleap 2703 LED IPS 2560x1440 WQHD 27... KB Paradise 60% EVGA SuperNOVA 850 G2 220-G2-0850-XR 850W  
CaseMouseMouse PadAudio
Fractal Design Arc Midi ROCCAT Kone Pure ROCCAT Taito Mini-Size 3 mm Aune T1 DAC and Tube Amplifier 
Other
AKG K242 HD 
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post #5 of 5
Quote:
Originally Posted by Blanco111 View Post

I am getting the Corsair AX1200i power supply. The PSU has something called Link that's supposed to enable controlling fan speeds. If I connect the fans to the front fan controller, and the front fan controller connects to the PSU via molix cable, will I be able to control the case fans with the Link software even though they are connected to the front fan controller?

Install the corsair link software, but don't use it to control your fans. and make sure it doesnt start with OS.

It is interesting to view the power draw by the PSU during different load conditions (in the power display of corsair link software), so you can see how little and how many watts your computer is using during different tasks. But this isn't going to change much, so once you've seen what it draws at idle, and what it draws under full load (cpu + gpu intensive benchmarking), and maybe during gaming sessions, you will have the info you need. and you will probably never need to run that program again.

It is constantly monitoring, therefor using system resources, so why waste them.

Your motherboard and bios will watch your fans for you.

Also, i stand by the fact that in terms of case fans, you only need 1 speed, maybe 2 for winter/summer. Let the mobo control your cpu fan speeds in different load conditions.

Other than that, i don't think you need to focus too heavily on controlling your fans, just set them and forget them and use your computer!!
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