Lenovo x3300 M4 7382 Installation And Service Manual page 198

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