Lenovo ThinkSystem SR650 V2 - Page 169

Rear backplane: 4 x 2.5-inch SAS/SATA
The following shows the cable connections for a rear 4 x 2.5-inch SAS/SATA backplane if installed.
From To
Backplane 4: SAS CFF expander: C3
Backplane 4: PWR Riser 1: PWR1, PWR2
Figure 115. Cable routing for the rear 4 x 2.5-inch SAS/SATA backplane
Chapter 3. Internal cable routing 159