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<blockquote data-quote="R2D2" data-source="post: 690055" data-attributes="member: 64945">I use Corsair&#039;s AX1200i PSUs (previously Coolermaster PSUs with active PFC) in my 2 home desktop PCs and when these are run off a modified/stepped sine wave UPS during a power failure there&#039;s a loud buzzing noise from the unit that becomes quite unbearable after a while. On the other hand, my old non-active PFC supplies work well with modified sine wave UPSes.So, I changed over to the Smart-UPS sine wave models but retained the Back-UPS to act as a stabilizer for my TV and its satellite receiver. Mains power supply (230 VAC/50 Hz) gets a bit flaky where I live and that&#039;s putting it mildly. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite109" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />Also, according to a Corsair tech who was responding to a user query back in &#039;11:<a href="http://forum.corsair.com/v3/showpost.php?p=532123&amp;postcount=2" target="_blank">The Corsair User Forums - View Single Post -&nbsp; UPS for Corsair AX850, HX750 - is adaptive sinewave UPS enough?&nbsp; Need pure sine wave?</a>The thing is, Corsair&#039;s been coy about an official answer to this query. But you are right, PSUs CAN work on modified sine wave UPSes but IMO a pure sine wave model would probably be better.</blockquote>

[QUOTE="R2D2, post: 690055, member: 64945"] I use Corsair's AX1200i PSUs (previously Coolermaster PSUs with active PFC) in my 2 home desktop PCs and when these are run off a modified/stepped sine wave UPS during a power failure there's a loud buzzing noise from the unit that becomes quite unbearable after a while. On the other hand, my old non-active PFC supplies work well with modified sine wave UPSes. So, I changed over to the Smart-UPS sine wave models but retained the Back-UPS to act as a stabilizer for my TV and its satellite receiver. Mains power supply (230 VAC/50 Hz) gets a bit flaky where I live and that's putting it mildly. :) Also, according to a Corsair tech who was responding to a user query back in '11: [URL='http://forum.corsair.com/v3/showpost.php?p=532123&postcount=2']The Corsair User Forums - View Single Post - UPS for Corsair AX850, HX750 - is adaptive sinewave UPS enough? Need pure sine wave?[/URL] The thing is, Corsair's been coy about an official answer to this query. But you are right, PSUs CAN work on modified sine wave UPSes but IMO a pure sine wave model would probably be better. [/QUOTE]

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