Hi Jay,
On Technical Overview documentation:
On E980 and E1080, the system design provides N+2 redundancy for system bulk power, which allows the system
to continue operation with any two of the power supply units functioning.
On E950, the power supplies are N(3)+1 redundancy.
On E1050 power supplies feature 3+1 redundancy. When 1 PSU is defective during runtime, the system continues to run with full
performance. When 2 PSU is defective during runtime, system continues to run but may throttle as needed.
Regards