Figure 101. 4U PCIe riser power cables
Table 36.  4U PCIe riser power cables
Length From To
1  230 mm (shorter)  PCIe riser cage 2
upper power connector
2  320 mm (longer)  PCIe riser cage 1
lower power connector
Step 2.  Flip the 4U PCIe expansion tray upside down.
Step 3.  Align the power cable assembly with the key-shaped slots on the bottom of the 4U PCIe expansion 
tray, and slide it backward to secure it. 
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ThinkSystem SR860 V2Setup Guide