Help figuring out how to connect fans to motherboard.

[geobasinas]

I have an Asus ROG strix x570-e gaming motherboard that after some research I found out that it only has 2 chassis fan headers. I have six fans that I want to connect to my motherboard and now I need help.

 

What should I do now ? Any advice would be great!!

[JKRsega]

Your case should come with a fan hub.  Connect them to that.

[Middcore]

Get splitters or a fan hub. 

[mdtaUK]

If your case does not come with a fan hub, you could get one.

 

Then you have an option to move from 6 to 4, and use two Y splitter cables to connect two sets of two.

 

Then perhaps there is an option to connect the last two up to Sata power with a cable converter, they wont ramp up or down but they would be powered.

something like this: https://www.amazon.com/CRJ-4-Pin-Sleeved-Power-Adapter/dp/B0711CR7HV

[GuiltySpark_]

$10, 10 outputs, SATA powered. 

 

https://www.amazon.com/ARCTIC-Case-Fan-Hub-Distributor/dp/B0887VG14J

[mariushm]

You can use ANY fan header except the CPU_FAN one which may have its speed adjusted automatically by bios depending on bios setting and temperature.

 

FROM MANUAL, PAGE 32 : https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/ROG_STRIX_X570-E_GAMING/E15826_ROG_STRIX_X570-E_GAMING_UM_v2_WEB.pdf

 

CPU_FAN and CPU_OPT share the speed, they're always same speed if fans have 4 wires.

if you put 3 wire fan in cpu_opt, it will run at 100%

AIO_PUMP and W_PUMP+ are fan headers that are always running at 100% - they're intended to be used with water cooling, but they're just stronger fan headers, you can connect case fans on them but they'll run at 100% all the time.

 

 

 

[Hairless Monkey Boy]

3 minutes ago, mariushm said:

AIO_PUMP and W_PUMP+ are fan headers that are always running at 100%

The default for these is in fact 100%, but in my experience with Asus boards over many generations, these are also PWM controllable in BIOS or in software.

 

So OP has 5 controllable headers available for the six fans. Stick a splitter on the W_PUMP+ header since it has the highest amp rating and you're good to go.

[mariushm]

You would have to check the BIOS options, or the software that comes with the motherboard.

 

Just because it says Q-Fan controlled, doesn't mean it is always controlled by Q-Fan or the speed is dynamically adjusted. You may be able to go in BIOS and exclude that header from speed control, or you may be able to set that at 100%. You have to check the motherboard bios options.

 

CHA_FAN1 , CHA_FAN2 and M.2_FAN are for sure generic fan headers, with the ability to control speed using Q-Fan. They just named the generic fan header M.2_FAN because it's close to the M.2 connector. 

It's a bit funny because you have to M.2 slots, and the CHA_FAN1 header (above the first m.2 connector) would have been more worthy of being called M.2_FAN header.

 

Unless those case fans also have RGB, I would suggest going for a simpler  1 to 2  or 1 to 3 fan splitter cable.  As the fan headers support 1A of current,  and the case fans are most likely using less than 0.25A of current, connecting 3 fans to a single header would be fine.

So you could use the AIO_PUMP header at the top to connect 2-3 fans, and two headers at the bottom of the board for the others.  Or, maybe use the CHA_FAN1 header near the top M.2 slot, if you don't mind cables going across the motherboard.

 

Example of such cable splitters ... this is a 2 pack : https://www.amazon.com/Cable-Matters-2-Pack-Way-Splitter/dp/B07PXLHNZ6/

 

If you look at pictures, you will notice 2 of the 3 outputs will not have a pin - that's the pin that tells the motherboard how fast a fan spins - you don't want each of the 3 fans report a different fan speed to the motherboard and have those 3 signals mixed because motherboard may read that as a different speed,  so only one fan connector will have that pin, and only that fan's rpm speed will be reported back to the motherboard.