Both the molex and the fan header need to be plugged with the APD2. If you're getting a bit of noose at 2000 RPM, 99% of the time it's a pesky air bubble. In the 1st post on page 1 of this thread, there are instructions on how to remove air bubbles from an H220- these are also applicable in your case.
thank you, ill try to fix this.
also how do i control the pump speed? in bios it says 40% as minimun (i have z87 msi mpower board), and in win can i use speed fan or?