Question Motherboard Has 1 Fan Input, But I Have 3 Fans

[cem.tgg]

Hi guys,

I am planning to buy Gigabyte B450M S2H, according to the Gigabyte's site, the motherboard has only 1 system fan input, but I have already 3 fans in my case. How can I connect the other 2?

 

[erik62905]

There's a fan header specifically designed for the CPU, and there's a fan header designed for the case fans. If you have one CPU fan and two case fans, plug the CPU fan into the CPU_FAN header (near the CPU) and buy a two-way fan splitter for the case fans. If you already plugged in the CPU fan and there are 3 case fans, buy a 3-way fan splitter and plug them into SYS_FAN1.

2-way fan splitter: https://www.amazon.com/Rosewill-Spl...+fan+splitter&qid=1567367760&s=gateway&sr=8-7

3-way fan splitter: https://www.amazon.com/Phobya-3-Way...+fan+splitter&qid=1567367787&s=gateway&sr=8-4

 

[cem.tgg]

There's a fan header specifically designed for the CPU, and there's a fan header designed for the case fans. If you have one CPU fan and two case fans, plug the CPU fan into the CPU_FAN header (near the CPU) and buy a two-way fan splitter for the case fans. If you already plugged in the CPU fan and there are 3 case fans, buy a 3-way fan splitter and plug them into SYS_FAN1.

2-way fan splitter: https://www.amazon.com/Rosewill-Spl...+fan+splitter&qid=1567367760&s=gateway&sr=8-7

3-way fan splitter: https://www.amazon.com/Phobya-3-Way...+fan+splitter&qid=1567367787&s=gateway&sr=8-4

I have 1 CPU and 3 case fans. My fans are 3 pin, but my Mobo fan head is 4 pin. If I use a splitter (mobo head is hybrid, it can control the speed both 3 pin and 4 pin) will they be controlled over speed?

 

[Karadjgne]

As long as the bios is set for the headers to be controlled auto/voltage and not pwm, then yes.

 

[cem.tgg]

As long as the bios is set for the headers to be controlled auto/voltage and not pwm, then yes.

Okay thank you very much, but I have one more question. I've found a cable that has 4 pin female, 1x 4 pin male and 2x 3 pin male connections. Can I use it?

 

[Karadjgne]

That's a pwm cable but yes it'll work just fine, the 4pin cable has a tach, the 3pin cables don't. So 2 of the fans will be running at what ever voltage the header sets according to the third.

I do have one question, since these are 3pin analog DC voltage controlled fans. Exactly what does the fan say on the back, in either A or W. Your fan header is only rated at 1A, that's 12W. If all 3 fans add up to more than that, you can only use 2 or you'll fry the header.

 

[cem.tgg]

That's a pwm cable but yes it'll work just fine, the 4pin cable has a tach, the 3pin cables don't. So 2 of the fans will be running at what ever voltage the header sets according to the third.

I do have one question, since these are 3pin analog DC voltage controlled fans. Exactly what does the fan say on the back, in either A or W. Your fan header is only rated at 1A, that's 12W. If all 3 fans add up to more than that, you can only use 2 or you'll fry the header.

I don't know it doesn't say anything, they came with the case, Phatenks P350X, its stock fans. Fans are Phanteks too, but according to the Phanteks website, I think they are 0.2A.