IBM System x3950 X6 Product Manual page 24

The combined power consumption of all the adapters that are installed in the Full-length I/O Book cannot
exceed 300 W.
Note: The 2x3 connector is intended to be used only when one adapter is installed in the first x16 slot (the
up-most slot in the following figure), either requiring 225 W or 300 W of power. The location of the 2x3
connector prevents an adapter from being installed in the other x16 slot.
Figure 11. Full-length I/O Book
The Half-length I/O Book installs flush with the Primary I/O Book at the rear of the server. The Full-length
I/O Book, when installed, adds a 76 mm (3 in.) mechanical extension to the base length dimension of the
chassis.
The following figure shows a Full-length I/O Book and a Half-length I/O Book that are installed in the
server.
Figure 12. Optional I/O Books that are installed (x3850 X6 shown)
IBM System x3950 X6 24