Help with MB fans connectors and other little doubts

[wsarahan]

Hi guys

I have a GA-Z87X-OC Force MB and the MB has a lot of PWM fans connectors

Today `ll change the radiators fans, but when i bought this machine it was not me that mounted it

So i have a question here, as you can see in the image manual i uploaded there is a cpu fan and a cpu opt_fan one near each other:

Should i connect the both radiators fans in this connectors?

If yes why the OPT fan when i monitor spins very slow compared to the cpu fan one and when i run a prime or a IBT it starts to run almost as equal as the cpu fan one?

Another question:

At bios i have all the option to set all the PWM fans or to auto / manual / quiet / full speed , i saw a huge difference at prime and IBT temps setting the fans at bios tor run at full speed from the beggining instead set to normal, even with the normal option enabling the PWM on and getting the same RPM as the full speed when i stress the PC, why this happen? Should i let all full speed, just opt full speed, just cpu full speed or let as it came and leave all normal and let PWM works itself?

Hope you understand my doubts, my english is not so good

Thanks guys

 

[Ninhalem]

I would first get a PWM splitter like the Swiftech 8-Way PWM Cable Splitter so that you can connect multiple PWM fans to the CPU header on the motherboard.

As for the BIOS setting, I would just leave it on auto to let the motherboard regulate the speed of the fan which is dependent on the temperature that the motherboard is reading on the CPU. It will run at full speed since you're stressing the system with Prime. If you want, you can even run something like SpeedFan instead of using the motherboard controls.

 

[wsarahan]

I would first get a PWM splitter like the Swiftech 8-Way PWM Cable Splitter so that you can connect multiple PWM fans to the CPU header on the motherboard.

As for the BIOS setting, I would just leave it on auto to let the motherboard regulate the speed of the fan which is dependent on the temperature that the motherboard is reading on the CPU. It will run at full speed since you're stressing the system with Prime. If you want, you can even run something like SpeedFan instead of using the motherboard controls.

Even with all my 4 pin fans MB connector being PWM ones you think i should not use the opt_fan to the second fan like is right now with the old ones?

If yes why should i connect all the fans at only one connector like you said the cpu_fan one?

Please don't let me wrong, you know much more than me, the question it's just a curiosity and to learn more about this stuffs

Thanks again man

 

[Ninhalem]

You can split up the fans between the two fan headers if you want, that's not a problem. Where you will run into a problem is that the fan header itself can only support so many fans.

There is a specification on the fan header that tells you how many amps (A) that the header can output. Your fan specifications tell you how many A are required for input. You can do some quick math to see how many of your fans could be supported on that single fan header.

That's why I recommended the PWM splitter. All you are doing is sending the PWM signal to the CPU header which allows the motherboard to control the signal being sent out to the splitter and eventually the other fans. The nice part about the splitter is that the power is being supplied directly from the power supply via a molex connector instead of the motherboard fan header.

I am still trying to track down the A output for that fan header, but most fans like the Gentle Typhoons have a 0.80 A requirement.

 

[BonzaiDuck]

Even with all my 4 pin fans MB connector being PWM ones you think i should not use the opt_fan to the second fan like is right now with the old ones?

If yes why should i connect all the fans at only one connector like you said the cpu_fan one?

Please don't let me wrong, you know much more than me, the question it's just a curiosity and to learn more about this stuffs

Thanks again man

Probably a splitter cable meant for that purpose is the way to go -- if you need to use one. You can also solder the power-wires (black and red, or blue and red) in parallel, but hope that using a single sensor wire (yellow) will still give accurate fan-control. And that's for the three-pin fans. If they're PWM four-pin, find a special splitter cable to purchase, or give up on running a 2-for-1 assembly off the same port.

Also -- and there seem to be several threads on this topic right now (I've posted to them) -- read your motherboard specs on maximum amperage per-fan and total for the motherboard -- all fans. You'll need to choose your fans for motherboard connection with these limits in mind.

Usually, a decent motherboard with CPU, CPU_OPT and System-Fan-1 (usually rear exhaust) will control all three according to CPU temperature. Review the BIOS setting options for fan control -- it should reveal what you need to know.

 

[coffeejunkee]

Your motherboard actually has only one real pwm header and that's the one for the cpu. All others are voltage controlled (sys_fan 1-5) or have no speed control at all (sys_fan 6-7).

But I´m not quite sure what your question is. What aio cooler are you using? If it has 3-pin fans the one on the cpu_fan header is likely running at full speed constantly and the one on the cpu_opt is being controlled according to cpu temps.

As for normal bios fancontrol profile, yes it's usually quite relaxed and setting it to full speed manually will make a big difference in temps. But also create much more noise.

 

[wsarahan]

Your motherboard actually has only one real pwm header and that's the one for the cpu. All others are voltage controlled (sys_fan 1-5) or have no speed control at all (sys_fan 6-7).

But I´m not quite sure what your question is. What aio cooler are you using? If it has 3-pin fans the one on the cpu_fan header is likely running at full speed constantly and the one on the cpu_opt is being controlled according to cpu temps.

As for normal bios fancontrol profile, yes it's usually quite relaxed and setting it to full speed manually will make a big difference in temps. But also create much more noise.

I have the H110 one, he has just one 3 pin plug to the bump, so it's ok to connect at the non pwm connector

The cpu_fan and the opt_fan is not pwm ones? At the manual it says that they have the pwn function, or am i wrong?

So what should i do and where should i connect my radiators fans? Now like i said one is connected at cpu fan and the other one at opt_fan, and the opt_fan is always spinning slower just when you stress or the cpu needs more air juice it starts showing your force and runs with the same rpm that the fan connected at cpu_fan spins all the time, about 1500 rpm and the opt_fan at idle about 700/800 rpm

Thanks again man

 

[coffeejunkee]

If you look closely at the manual you see it says for the cpu fan pin 2 = 12V and pin 4 = speed control. The others say pin 2 = 12V/speedcontrol, which means they use voltage to control the speed.

But I think you are not using the correct bios settings. The H110 fans are pwm controlled and the one on the cpu_fan header shouldn't be running full speed all the time. You can also try if Speedfan works for your motherboard.

 

[wsarahan]

If you look closely at the manual you see it says for the cpu fan pin 2 = 12V and pin 4 = speed control. The others say pin 2 = 12V/speedcontrol, which means they use voltage to control the speed.

But I think you are not using the correct bios settings. The H110 fans are pwm controlled and the one on the cpu_fan header shouldn't be running full speed all the time. You can also try if Speedfan works for your motherboard.

Sorry man it was my mistake

It is not running 100% all the time just checked here

It runs with 1100 rpm when idle and the OPT runs 900 RPM when idle, if i put some stress test both goes to the limit, almost 1600 RPM, this using the default settings, but as you said i can make my own cooler curve with the Gigabyte EasyTune app, so everything is ok right?

Another question:

In the rear of my case i had the Corsair 140mm quiet Edition and it runs very slow, but it was a 140 mm fan but i have here a GentleTyphoon 120mm D1225C12B5AP-15 that fits my cosmos 2 without any problem and runs at 1850RPM at 12V (3pins) is more deal to use the Gentle one 1850RPM 120mm or the Corsair 140mm 1100 RPM?

But even with the GentleTyphoon it`s not running at 1850, it stays at 1790/ 1800/1750 RPM when monitoring by software, is it normal?

Thanks again

 

[wsarahan]

Anyone?

 

[Ninhalem]

That GT is not a PWM fan. It's normal to see the fan not run at complete full capacity when connected to the motherboard. The GT in particular is going to be your best fan by far for cooling, especially when attached in water cooling setup to a radiator.

 

[wsarahan]

That GT is not a PWM fan. It's normal to see the fan not run at complete full capacity when connected to the motherboard. The GT in particular is going to be your best fan by far for cooling, especially when attached in water cooling setup to a radiator.

The GT can't be used at H110 because it's 140mm and the GT 120mm that's why i put in the rear at the case, should i let the 120mm GT at the rear case or come back with the AF140mm or use the Akasa Viper 140mm PWM 110 CFM in the rear?

Thanks again

 

[Ninhalem]

You can put a fan adapter on the H110 to go from 140 mm to 120 mm.

 

[wsarahan]

You can put a fan adapter on the H110 to go from 140 mm to 120 mm.

But now i already bought the panteks 140mm PWM, will use it

 

[BonzaiDuck]

You can put a fan adapter on the H110 to go from 140 mm to 120 mm.

I've done that, and I even fitted a switched circular neon case light to it. The case light didn't help with cooling, but . . . it was nice . . .

So are the fan adapters . . .