1x Dual Power System (DPS) Slot, Backup VRM. Also doubles phases while running.

To use Dual-Channel mode, install up to four memory modules in the orange and purple DIMM slots. If more than two purple slots are to be used, user should insert only single-sided memory modules to all purple colored DIMM slots. It is recommend to use double-sided memory in orange slots if four purple slot configuration is attempted, in order to avoid hardware reserved memory or performance problems (mixed modules should work; be aware that Orange DIMM = 2x Purple DIMM in capacity). If installed correctly, you will also be running in Dual-Channel mode with 6 memory modules.