ThinkSystem ST650 V2 2.5" SAS/SATA 8-Bay Backplane Kit
This option kit comes with the following components.

1 One 2.5-inch hot-swap SAS/SATA 8-bay backplane
2 One Mini-SAS x4*2 to SlimSAS x8 (640 mm)
3 One SlimSAS x8 to SlimSAS x8 (720 mm)
4 One SlimSAS x8 to SlimSAS x8 (880 mm)
5 One 2.5-inch backplane power (400 mm)
6 One 2.5-inch backplane power (300 mm)
7 One SlimSAS x4*2 to SlimSAS x8 (430 mm/430 mm)
8 One label (SAS/SATA)
See Install server hardware options for more information to install the option kit.