IBM 88743BU - System x3950 E User Manual page 30

ScaleXpander chip required to convert the x3850 M2 to an x3950 M2. See
Figure 1-5 on page 8.
x3950 M2 bezel, which replaces the existing bezel and shows the x3850 M2
has the kit installed and is now functionally equal to an x3950 M2. See
Figure 1-9 on page 13.
Figure 1-7 x3950 M2 enterprise cable management arm
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Planning, Installing, and Managing the IBM System x3950 M2