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I have this PSU and this UPS, however due to the PSU being/having an active PFC (power factor correction) it is incompatible with my UPS (at least according to APC tech support, for reference see my answer to this question

Now I'm thinking of changing my UPS to this (same brand with my PSU) however I am not sure if they are compatible. I already emailed FSP support but they are taking long to reply. I was wondering maybe someone here can answer my question. Thanks.

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did it improve when you went direct to the wall supply ? – Sirex Feb 3 at 15:07
@Sirex Yes no problems – IMB Feb 5 at 10:58
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APC support is full of it. There may be some badly behaved power supplies out there, but most quality supplies these days have PFC and work just fine with a UPS. In any case, it is only an issue while running from the battery.

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+1, they've fobbed me off before also. – Sirex Feb 6 at 14:23
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