IBM System x3300 M4 Installation And Service Manual page 345

16. For server models with eight 3.5-inch simple-swap hard disk drive with the
fixed power supply and the ServeRAID adaptery:
Note: It is necessary to use one 2*7 pins to 2*8 pins power cable for these
server models come with a fixed power supply.
17. For server models with four 3.5-inch simple-swap hard disk drives with the
redundant power supply:
Chapter 6. Removing and replacing components
327