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The original was posted on /r/hardware by /u/Excelsoxls on 2023-08-08 19:54:50+00:00.

So I’m having a little bit of trouble figuring out how I should connect my AIO liquid cooling.

My mb doesn’t have a cpu_opt or dedicated pump connector, it has just cpu_fan and two sys_fan headers.

I want to connect the pump to the cpu header so it can be closely monitored for failures, but at the same time I want to also connect the rad fans to the cpu header so their rpm is tied to cpu temperature.

This is what I’m thinking of doing:

The two rad fans will be connected with each other using a Y splitter that comes with the AIO;

The pump will be connected to another Y splitter that I bought, on the 4 pin end, and the rad fans will be connected on the 3 pin end of that splitter;

I’ll connect everything to the cpu_fan header.

I’ve read in some places that by doing that I’ll get the pump rpm monitored by the system as it is connected to the 4 pin end of the splitter. At the same time, it will NOT have it’s speed controlled because it doesn’t have the 4th pin. As for the fans, they won’t be monitored, but WILL get their speed controlled as they do have the 4th pin for PWM signal.

The problem is that someone told me that by connecting the pump to the 4 pin end I’ll force everything to work in DC mode, which got me confused because there’s even an option in the bios to ensure that the cpu_fan header works in PWM mode.

So after all, what will happen if I do that?

Here’s the model of the mentioned parts:

AIO: Cooler Master MasterLiquid ML240L V2 ARGB

MB: B550M Aorus Elite