How do you have the dual fans and the pump connected? If the fans are on the Y-splitter and plugged into the CPU FAN header, they should run at reduced speed (as per the BIOS) until needed to ramp up. The pump should be connected to any SYS FAN header that can be set to run at full speed all the time. On an AIO like that, you really should keep the pump running at full speed all the time. But the fans will run slow and quiet just like a stock cooler fan.