Lenovo System x3300 M4 Installation And Service Manual page 190

8. For server models with eight 3.5-inch hot-swap hard disk drives with the fixed power supply and the
serveRAID adapter:
Note: It is necessary to use one 2*8 pins to 2*7 pins power cable for these server models come with
a fixed power supply.
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System x3300 M4 Installation and Service Guide