Boris: what, you mean don't use a cpu fan?
King: sure, no problem, you just need to set 'cpu fan warning' to ignore in uefi to prevent warning message when starting up pc.
Next, in Fan Xpert 2 first use 'Fan Tuning' procedure. Cpu fan will be detected as being a casefan, but this is no problem since Fan Xpert 2 uses cpu temps to determine speeds for all fans anyway. Do note that the profile is less aggressive for the casefans, but you can manually adjust it if you want lower temps.