Thank you for your reply.
"can always connect" : Not always. My 3-pin connector is blocked from connecting horizontally by design with the 4-pin male connector (see picture below). The design of the plastic blocks the connection on the AORUS PRO motherboard.
"It's not an issue": Google show others with the same question, usually with answers that are not clear. Some of these questions are years old. Perhaps you have too much experience? This is only my 3rd build.
But I noticed there's only one wire connected in the 3-pin connection. Why would Corsair use a 3-pin connector to connect one wire? What is the one wire doing from the iCUE H150i pump connecting with CPU_FAN? What if I don't make any connection?
I noticed If I rotate the 3-pin connector I can get one pin to connect vertically on the left of the 4-pin horizontal connector. The one pin connecting is pin 4, PWM Speed Control, according to the Z690 AORUS PRO User's Manual. But that Gigabyte documentation also says the black wire is GND, and the Corsair single wire is black. But it would seem to make sense this might be PWM Speed Control.
In the picture below the 3-pin connector is vertical and the 4-pin connection is horizontal. Notice the plastic along the top that blocks a horizontal connection.. The picture shows the single-wire connection, with the other 3 horizontal pins on the male connector are not used.. (The bottom two female connections on the vertical 3-pin connector are also not used.)
This is the only issue I must resolve before I can power on my new system and start testing. I guess I could take the chance that the only way the connection can be made might be right?
The 3-pin graphic in the Corsair documentation is TOTALLY WRONG for my mother board. What's good is documentation when it's wrong?
