I compared two 1200W units (both with active PFC) around the same manufacturing time, an ATX unit and a compact hot swap server unit: the ATX unit had 780uF input DC filtering capacitance compared to 390uF for the server unit, and the server unit had smaller PFC components (and heatsinks) for its size.
Also, the ATX unit was rated at 1200W output under full line voltage range, but the server unit (full rating at 200-240V line input) was derated to 900W at 110-120V input and 800W at 100-110V input.
Typically (in my belief) in a 100-120V region, server rooms have 220-240V mains power, and I have seen server PSUs which require a three phase AC input, one of which was an IBM unit built by Fuji Electric.
Also, the ATX unit was rated at 1200W output under full line voltage range, but the server unit (full rating at 200-240V line input) was derated to 900W at 110-120V input and 800W at 100-110V input.
Typically (in my belief) in a 100-120V region, server rooms have 220-240V mains power, and I have seen server PSUs which require a three phase AC input, one of which was an IBM unit built by Fuji Electric.
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