I chose the x99 platform, because they will be available pretty cheap, as x299 is here, but x299 looks rushed to me, so I'm gonna stick to the one that seems working. And it can also be converted into a server once the datacenters start to get rid of their xeons for newer stuff. I'm done with Z boards, especially Gigabyte, since their functions are quite limited. I have a Z170 from Gigabyte at the moment, which does not let me control the fans from the bios (you can set them to silent/normal/fullspeed, from which the first 2 are identical), or you can create a custom curve from their standalone app which does not work correctly. I'm not sure about AMD yet, that's why I'm sticking to intel for now.
That is a solution indeed, but what I'm aiming for right now is a water cooling loop to keep it silent, while setting the fans to stop if the components are cool, so splitting the same pwm to the pump does not look like such a great idea, since that would stop too, and that way my components won't be able to benefit from the passive cooling of the rads.
Wow, this actually looks great, I'm putting it on my list.