I recently purchased a Nepton 280L cooler to replace my H80 that was not getting it done anymore. I had no problems with install and temps seem ok. My concern is the water pump RPM, hooked up to CPU1 or CPU2 fan header it runs at full rpm 6800. This seems really high, I submitted a ticket with coolermaster to see what is the proper rpm.
I currently have the pump connector connected to a SYS1 fan header and can control the rpm to around 4500. I do not want to under or over drive the pump. The motherboard is a MSI Gaming Z87-G45 with a i7-4770k.