Just as the other reviewer has mentioned, the first unit had high pitched noise issue. I waited about four days to make sure that it is permanent issue, and had it exchanged for the same unit.
Second unit, to my relief is quiet and without a drama to report on. It is relatively quiet, about as quiet as the OEM unit that died on me after 14 months of service. I took quick wattage reading from my APC, and it drains about as much as my OEM unit, which was rated at 350W.
Something to watch out for: Antec recently phased out EA-500 and replaced it with EA-500D, which is made by Delta, and not Seasonic as EA-500 (this unit). Delta is known for making OEM products, but their reputation is still pretty much unknown.
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