Question Anyone have any recommends for case fan splitters? I need two that wont set my pc on fire.

Jias

Commendable
Jan 13, 2020
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https://www.amazon.com/gp/product/B07KGYG8N7/ref=ox_sc_act_title_2?smid=ATVPDKIKX0DER&psc=1 Fans

https://www.amazon.com/gp/product/B08C7BGV3D/ref=ox_sc_act_title_4?smid=ATVPDKIKX0DER&psc=1 Case

https://www.amazon.com/gp/product/B00KG8K5CY/ref=ox_sc_act_title_1?smid=A1Z5H6ZGWCMTNX&psc=1 Splitters I was considering.

These are the fans I'm looking to install in the front of the case while using the stock fans on the back and ceiling. The pictures I have included show the places I was thinking about using the splitters on. Im also not sure if my splitters are compatible with the fans I have chosen.
 
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Jias

Commendable
Jan 13, 2020
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1,510
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If I use a PWM splitter on a dc fan will it cause a problem if I just let the mobo bios control the fan speed? Or will the fan just run on it's default speed all the time?
 

Paperdoc

Polypheme
Ambassador
A PWM signal system can NOT control the speed of any 3-pin fan. Control can be done ONLY by a mobo header that uses the older Voltage Control Mode. Almost NO PWM Hubs can do what you want, but there is ONE unit that can.

You do have another alternative. Use SPLITTERS, such as you were considering. To distinguish between the two, note that the Splitters you see have one input "arm" to plug into a fan header and two or more output "arms" where fans plug in. A HUB in any form has those types of connections PLUS a third type that must plug into a power output connector from the PSU. You cannot use a HUB for 3-pin fans.

All that fans you are considering (included with the case, and added) are 3-pin fans of a particular design now less common. The all have lights in their frames, but of one colour only that cannot change. These fans each have only ONE cable from them that plugs into a normal fan header. The LIGHTS are NOT the RGB or ARGB type now popular. The lights are simply connected in parallel with the fan motor so they light up whenever the fan has power, and their brightness may dim as the fan speed is slowed down. More importantly, they add to the power load drawn from the header. This is important because each mobo fan header can supply power up to 1.0 A max current to all items on that one header. When you use a Splitter, all fan power comes only from the header, so this rule applies. In your case, OP, the fans WITH their lights show they can use up to 0.30 A per fan. So you CAN connect up to THREE such fans to ONE header using a Splitter. Or, of course, you could connect two fans each to two headers, and the last fan to a third header. Just configure all fan headers you use exactly the same so they do the same thing.

IF you want a Splitter with THREE output arms, here's an example

https://www.amazon.com/Cable-Matters-2-Pack-Way-Splitter/dp/B07PXLHNZ6/ref=sr_1_3?crid=2BPXJ22K4CJV5&keywords=fan+splitter&qid=1660141437&sprefix=fan+splitter,aps,108&sr=8-3

Two points for Splitter use. You CAN use a 4-pin Splitter for 3-pin fans - no problem, the fans simply will not connect to Pin #4. Look closely at the Splitter output male connectors and you will see that only one has all 4 pins, and the others are missing Pin #3. This is because the mobo header can only deal with the speed signal returned to it from ONE fan. So the header can "see" only ONE of the fans on the splitter and display its speed for you; all other fan speeds on that Splitter / header will never be seen. This has NO impact on ability to control the fan speeds. But you MUST plug one fan into the only Splitter output that HAS all 4 pins.

In this situation, OP, you should ensuree that each fan header you use with these is configured correctly in BIOS Setup. On the config screen for each header at upper right you can choose whether it use PWM Mode or DC Mode. Set for DC Mode for use with 3-pin fans.
 

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