BTF3.0 (via Uniko's Hardware) is designed so that no cabling is needed between your PSU, motherboard ... pictured), all a PC DIYer should need to wire up are the CPU cooler, system fans, RGB ...

At the motherboard socket we've just placed the risers/washers on which the CPU block will site. You need to connect the pump wire to a secondary or dedicated pump FAN header and the fans towards ...

Mounting the cooler is a relatively easy thing to do, though the motherboard needs to come out of the chassis unless you have a chassis with a mainboard cutout for CPU cooling. Now you first ...

leaving the front of the motherboard that's visible completely wire-free. It looks like the GPU also has rear-racing PCIe connectors, though it's not totally clear in the photos. Presumably there ...