What is the efficiency rating of this PSU and how does it affect the overall performance of the mining rig?

80 Plus Platinum Certified - Deliver up to 95% efficiency and reduce operating cost,Support INTEL and AMD quad-core CPU independent graphics card

Is this power supply compatible with both 220V and 240V outlets, and does it automatically switch between voltages?

Universal AC Input Design - Stable enough for 180-240V voltage input available

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HaoJieHan 1800W Mining Power Supply,6/8 GPU ETH BTC Rig Ethereum ATX Mining Rig System PSU,180-240V PC Modular Miner Power Supply

80 Plus Platinum Certified - Deliver up to 95% efficiency and reduce operating cost,Support INTEL and AMD quad-core CPU independent graphics card
140mm Dual Ball Bearing Fan - Providing maximum airflow and near-silent operation
Universal AC Input Design - Stable enough for 180-240V voltage input available
Active PFC - Enhances power output efficiency and increases the performance and stability of your system.Magnetic amplifier circuit, high suburban rate, low continuous wave
EMC Anti-electromagnetic Interference - Full copper output wire and sufficient material & high transforming rate