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Old 04-11-2012, 10:38 AM   #1
fluxbox
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Default Does Active-PFC helps in the case of unstable input voltage ?

Hi,

I live in a place where the input voltage is unstable (165v-220v) during the night. Blackouts are rare though. With my current PSU (local brand you've never heard), low input voltage leads to reboot. Does active pfc helps in this case ? i know that i should get a UPS. But UPS will make total power efficiency worse so i'd like to make UPS as last resort. I'm considering Seasonic S12II 530W

My current spec :
MSI P55-CD53
i5-750 @bclk 166 (oc'ed from 133) (i modify bclk only, vcore and power saving features is at default settings.
2x4gb gskill ddr3 @1600mhz (xmp profile)
his radeon 6850, undervolted to 1v from 1.15v, no side effects except lower temp
500 gb wdc black edition

This comp runs fine and stable, unless there's a drop in input voltage which usually lasts for 15 minutes or so.

Thanks in advance and feel free to correct my english as it's not my native language
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Old 04-12-2012, 12:14 PM   #2
Gabriel Torres
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Hello and welcome to our forums.

With a power supply with active PFC, usually you can plug your power supply to any voltage between 90 V and 240 V and you will be fine.

UPS is not recommended in your case, because it does not do anything with the voltage, it only kicks in when there is a power failure. If you want a product to improve the AC voltage that enters your computer, you should consider a voltage conditioner (a.k.a. voltage stabilizer).

I hope I have helped.

Gabriel
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Old 04-12-2012, 06:49 PM   #3
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Thanks for clarifying. I was considering UPS because some of them have built in AVR. I just got myself a Seasonic S12II 620W, no reboots so far.

And oh yeah i really enjoyed reading your articles about PSU. Oh man, i wish i read them sooner. I went cheap on PSU thinking it doesn't improve performance. But thanks to you, now i know that good PSU pays off in the long run, better lifetime of cpu components and psu itself, lower electricity bills etc.
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Old 04-13-2012, 10:21 AM   #4
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Thanks! I'd add that a good PSU also prevents your computer from random crashes...
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