Sorry, but I disagree. Neither FSP models support PFC - mandatory in Europe, likely soon to be in the US. If planning on using that PS for a few years, I would shoot for one with active PFC - it will cost more to begin with, but it will run more effeciently and same operating costs over the long run.I agree with Conroe on the two FSP PSUs - great choices at a great price.
But if you're not being billed by power factor - and if you're a home or small business, you're probably not - then an Active PFC PSU, or any other kind of power factor corrected hardware, isn't going to consume any less real power than cheaper gear without PFC. It'll actually probably consume a little bit more, and that little bit more will be noticed by your electricity meter, though the cost per year of this extra is unlikely to be more than you can find down the side of the couch.
If you want to do your part to clean up the mains, then PFC PSUs are a good idea. This might also qualify as enlightened self-interest, because the rate that domestic power consumers are charged per kilowatt-hour is no doubt influenced by their overall power factor. Everyone who swaps out low-power-factor gear for PFC gear lightens the load on the grid, and this may delay power price rises (or, if you live in Happy Land, actually cause the price per kilowatt-hour to drop).
Active PFC PSUs may also deal with lousy mains power better than passive PFC units, but PC PSUs generally handle spikes and surges and dropouts pretty well already, and a proper outboard power conditioner is a better solution to that problem, anyway.
So by all means, buy an Active-PFC-equipped PSU if you like; they do no harm, and they're generally high quality in other respects as well. But don't think that PFC of any kind is going to save you any money, if you're using ordinary domestic power.
An excerpt from this Dansdata link.
But if you're not being billed by power factor - and if you're a home or small business, you're probably not - then an Active PFC PSU, or any other kind of power factor corrected hardware, isn't going to consume any less real power than cheaper gear without PFC. It'll actually probably consume a little bit more, and that little bit more will be noticed by your electricity meter, though the cost per year of this extra is unlikely to be more than you can find down the side of the couch.
If you want to do your part to clean up the mains, then PFC PSUs are a good idea. This might also qualify as enlightened self-interest, because the rate that domestic power consumers are charged per kilowatt-hour is no doubt influenced by their overall power factor. Everyone who swaps out low-power-factor gear for PFC gear lightens the load on the grid, and this may delay power price rises (or, if you live in Happy Land, actually cause the price per kilowatt-hour to drop).
Active PFC PSUs may also deal with lousy mains power better than passive PFC units, but PC PSUs generally handle spikes and surges and dropouts pretty well already, and a proper outboard power conditioner is a better solution to that problem, anyway.
So by all means, buy an Active-PFC-equipped PSU if you like; they do no harm, and they're generally high quality in other respects as well. But don't think that PFC of any kind is going to save you any money, if you're using ordinary domestic power.
PFC: Power Factor Correction: This has always been important for large scale commerical applications, now it is something that the home & small office user can also consider,
especially if you are going to be operating outside of north america. Here is a good explination of PFC: http://www.rojakpot.com/showarticle.aspx?artno=81&pgno=0
APC on PFC: ftp://www.apcmedia.com/salestools/SADE-5TNQYL_R0_EN.pdf
Exactly! It increases output power of the PSU - wasting less energy, some in the form of heat.Based on my interpretation, PFC does not inherently increase the efficiency of the PSU - it reduces harmonics in external lines and can increase output power of the PSU.
I agree, a 500W PS is a 500W PS.If a PSU is rated at a certain output, then that is the rating - PFC or no PFC.
Exactly! It increases output power of the PSU - wasting less energy, some in the form of heat.
None of the big names are without criticisms - even Antecs, a long time favorite, had problems revealed in Tom's PSU Stress Test. I have not found the failure rate of TT supplies to be any worse than the other big names - and the TT Silents Pure Powers can be very quiet.Despite TT's flaws, I've got a non-PFC 480W Silent PurePower that works great.
... may not be the point either. No direct benefit, as in a user will see no change in his monthly electric bill - yes, I accept that as true.PFC provides no direct benefit to the consumer in the form of increased efficiency or the resultant money savings.