There's almost always a proper, manufacturer-set order to how you should load the inks. The driver in your RIP is set to work with this particular order. Of course, because it is set by the manufacturer, there's not really an easy way for us to tell you which way to load them without knowing what kind of printer you have or what kind of RIP.
Did you receive a manual with this printer? You can probably find the order of the inks in the manual. You will have four channels for CMYK, and the other 4 will be devoted to white.