Frågade faktiskt Corsair om detta för någon dag sedan, svaret var:
"for the H115i PRO:
- connect the pump power cable to an available SATA power plug
- connect pump tach cable to the AIO_fan header on the motherboard
- connect each of the two fans to the shrouded 4-pin connectors on the pump. Do not connect fans to the motherboard!
AIO header on the motherboard is made specifically for the AIO pumps, so you don't get errors for low fan RPM."