Connect the SATA Power Ports
The Seasonic SS-760XP2 Power Supply Unit comes with 3 modular SATA Power Cables.
The shorter cable has 2 SATA Power Connectors.
The 2 longer cables have 4 SATA Power Connectors each.
For this build you need to power 7 SATA devices.
You goal is to power all 7 devices using the least amount of cables to prevent clutter.
You can do this by using the 2 longer SATA Power Cables which can power up to 8 connected SATA devices.
Store away the shorter SATA power cable for future expansion.