My guess is that from all the components this is really designed to handle 550W easily. However cooling (or rather lack thereof...) means it can't sustain this for a long time without overheating. Such behavior is quite common for fanless psus, though I agree it shouldn't be advertized as 550W (though I guess it might be possible it really is 550W if the airflow in your case is done in such a way that it moves some air through the psu too). In any case, imho there's not all that much value in high wattage fanless psus (you're not going to cool the rest of your system passively if you're burning more than 500W...).
I agree that you GPU will probably not be passively cooled and for now no CPU is, but every little bit helps. If you can make one part fanless the overall noise will be lower. At the moment that part is a 500W PSU (more then enough power). When they decide that the CPU is powerful enough they will start making passive coolers for that... At some point you will be able to build a powerful fanless system. The PSU is the first stepping stone, so i say kudos.
"I might have to take issue with the ‘zero dB’ claim, given that electrical noise is around 15 dB."
Doesn't this noise vary across configurations? Or is this a known spec of the PSU? I've seen reports on PSUs ranging from "complete silence" to "clearly audible electrical buzzing". I have a fanless Seasonic and the not-audible-from-my-sitting-position buzzing varies also depending on which components are attached to it.
I'm wondering about that too. Is the electric noise only ~15dB when fully loaded at ~500w? Or would it be there when just at the desktop and idle (or like 20% or less CPU usage with a haswell i7?). I know I wouldn't need 500w, but I figure going larger on the PSU would be better (it would stay well within temp limits since it is t always loaded) and some room to play with upgrades in the future.
Honestly though, 15dB at six feet or so (say for a HTPC) isn't really noticeable probably, especially if it's even less when idle or in standby during nights...
30 dB is a leaf rustling, and every 3 dB is 2x volume as it is a logarithmic scale. So 30 dB to 15 dB is 2^5 times differece, or 32x quieter. So you probably won't hear it, but from a physics standpoint it is erroneous.
But are you sure you can tell the difference between 15dB and 0dB with the required accuracy? I seem to recall that most noise measurements posted on AT use 30dB as a lowest reliable result. So really, what is the accuracy of your 15dB result?
It's 32 times the energy; but that's not the same as saying it sounds 32 times louder. Your ears (and eyes) work on log scales too; and a 10db difference is only perceived as an ~2x difference in how loud the sound is.
What happened to the Rosewill SilentNight 500W? It has a pretty much perfect 5 star set of reviews on Newegg, but has been not available for a while now. Haven't seen a replacement model..
Also be aware that it is the PSU that isolates the system from the noise of the power grid. If there is an air conditioner or refrigerator out of phase you can get electrical noise from that broadcast out to any device on that side of the fusebox. So you have to consider the electrical source when evaluating PSU devices, and that is not often listed in reviews.
"Perhaps I am naïve in power supply marketing, but I had assumed that the wattage listed was the average due to issues in the previous decade." I don't think you are at all naïve -- that's just Enermax. I've always been surprised at how good their reputation is compared to the quality of their work. The Rosewill Silent Night and Kingwin STR-500, for example, are rated at 500W but will actually output 600W (just at the lower 80+ Gold rating).
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thekimbobjones - Thursday, June 12, 2014 - link
Disappointing to see Enermax has rated this PSU as 550W when it is really a 500W. Dangerous territory.mczak - Friday, June 13, 2014 - link
My guess is that from all the components this is really designed to handle 550W easily. However cooling (or rather lack thereof...) means it can't sustain this for a long time without overheating. Such behavior is quite common for fanless psus, though I agree it shouldn't be advertized as 550W (though I guess it might be possible it really is 550W if the airflow in your case is done in such a way that it moves some air through the psu too). In any case, imho there's not all that much value in high wattage fanless psus (you're not going to cool the rest of your system passively if you're burning more than 500W...).SleepyFE - Friday, June 13, 2014 - link
I agree that you GPU will probably not be passively cooled and for now no CPU is, but every little bit helps. If you can make one part fanless the overall noise will be lower. At the moment that part is a 500W PSU (more then enough power). When they decide that the CPU is powerful enough they will start making passive coolers for that...At some point you will be able to build a powerful fanless system. The PSU is the first stepping stone, so i say kudos.
thewhat - Friday, June 13, 2014 - link
"I might have to take issue with the ‘zero dB’ claim, given that electrical noise is around 15 dB."Doesn't this noise vary across configurations? Or is this a known spec of the PSU?
I've seen reports on PSUs ranging from "complete silence" to "clearly audible electrical buzzing".
I have a fanless Seasonic and the not-audible-from-my-sitting-position buzzing varies also depending on which components are attached to it.
Acarney - Friday, June 13, 2014 - link
I'm wondering about that too. Is the electric noise only ~15dB when fully loaded at ~500w? Or would it be there when just at the desktop and idle (or like 20% or less CPU usage with a haswell i7?). I know I wouldn't need 500w, but I figure going larger on the PSU would be better (it would stay well within temp limits since it is t always loaded) and some room to play with upgrades in the future.Honestly though, 15dB at six feet or so (say for a HTPC) isn't really noticeable probably, especially if it's even less when idle or in standby during nights...
Ian Cutress - Friday, June 13, 2014 - link
30 dB is a leaf rustling, and every 3 dB is 2x volume as it is a logarithmic scale. So 30 dB to 15 dB is 2^5 times differece, or 32x quieter. So you probably won't hear it, but from a physics standpoint it is erroneous.ShieTar - Friday, June 13, 2014 - link
But are you sure you can tell the difference between 15dB and 0dB with the required accuracy? I seem to recall that most noise measurements posted on AT use 30dB as a lowest reliable result. So really, what is the accuracy of your 15dB result?DanNeely - Friday, June 13, 2014 - link
It's 32 times the energy; but that's not the same as saying it sounds 32 times louder. Your ears (and eyes) work on log scales too; and a 10db difference is only perceived as an ~2x difference in how loud the sound is.jeffrey - Friday, June 13, 2014 - link
What happened to the Rosewill SilentNight 500W? It has a pretty much perfect 5 star set of reviews on Newegg, but has been not available for a while now. Haven't seen a replacement model..http://www.newegg.com/Product/Product.aspx?Item=N8...
'nar - Friday, June 13, 2014 - link
Also be aware that it is the PSU that isolates the system from the noise of the power grid. If there is an air conditioner or refrigerator out of phase you can get electrical noise from that broadcast out to any device on that side of the fusebox. So you have to consider the electrical source when evaluating PSU devices, and that is not often listed in reviews.Icehawk - Sunday, June 15, 2014 - link
Can't recommend a fanless PSU more, really cuts the overall volume of a system particularly if you ditch all mechanical drives too.Sivar - Sunday, June 15, 2014 - link
"Perhaps I am naïve in power supply marketing, but I had assumed that the wattage listed was the average due to issues in the previous decade."I don't think you are at all naïve -- that's just Enermax. I've always been surprised at how good their reputation is compared to the quality of their work.
The Rosewill Silent Night and Kingwin STR-500, for example, are rated at 500W but will actually output 600W (just at the lower 80+ Gold rating).
mpbrede - Tuesday, July 29, 2014 - link
Do you have a methodology and equipment for testing PSUs?