Dell W66FF Installation And Service Manual page 52

Figure 40. Cable routing - 10 x 2.5-inch drive backplane on the onboard controller (4:6 NVMe)
Table 18. Connector descriptions for 10 x 2.5-inch drive backplane to the onboard controller (6:4 NVMe)
From
BP_PWR_1 (backplane power connector)
DST_PA1 (backplane SATA connector, cable marking BP PA1)
SYS_PWR2 (system board power connector)
DST_PB1 (backplane SATA connector, cable marking BP PB1)
DST_PA2 (backplane SATA connector, cable marking BP PA2) SL3_CPU1_PB2 (signal connector on the system board, cable
DST_PB2 (backplane SATA connector, cable marking BP
PB2)
DST_PA3 (backplane SATA connector, cable marking BP PA3) SL7_CPU1_PA4 (signal connector on the system board, cable
52 Installing and removing system components
To
SIG_PWR_1 (system board power connector)
SL1_CPU22_PB1 (signal connector on the system board,
cable marking MB SL9)
CPU_PWR2 (PSU power connector)
SL2_CPU2_PA1 (signal connector on the system board, cable
marking MB SL2)
marking MB SL3)
SL4_CPU2_PA2 (signal connector on the system board, cable
marking MB SL4)
marking MB SL7)