I came across this forum a back while looking for an answer to this question and found some excellent advise that I would like some additional info for.

I have purchased the above server in a 1U case however it's far to noisy for its location. I have moved the motherboard into a 4u case and hoping to use active cooling, using 2 pwm fans using an official HP splitter with a 4 pin adaptation.

Now this server needs all 6 fan headers connected to the board to boot and making those connectors is fine, however 12 fans in a pc that won't really require them for airflow due to the new 4u case and the active cooling on the heatsinks.

My question is can I connect the wires together to make 1 single 4 pin pwm connector as 1 sensor wire is for input and the other is output as the fans from the server are back to back running 8k rpm each or will I have to have all 12 fans.

Happy to give more information if required I tried to add photos but I needed more rep to post.