Seasonic S12G 650W Power Supply Review
by E. Fylladitakis on February 28, 2014 2:20 PM EST- Posted in
- Cases/Cooling/PSUs
- Seasonic
- 80 Plus Gold
Final Words and Conclusion
Today we witnessed the reason why Seasonic is so popular amongst enthusiasts and advanced users. The 650W version of the S12G is not the cheapest of its range and class, it has no extravagant features, and it is not even modular. When you look at it, it is yet another all-black ATX PSU; not even the ribbon-like black cables are in any way special nowadays. You can easily find an 80 Plus Gold certified and modular 650W PSU for around the same price.
On the other hand, when it comes to build and power quality, the Seasonic S12G can easily make most of its competition shudder. Seasonic usually picks very high quality components for their units and the S12G is no exception, with most of the primary components and all of the capacitors coming from Japanese brands -- and the S12G is their mainstream series, not their high-end brand! That alone says a lot about Seasonic's commitment to quality and why they so easily cover a mainstream unit with a five-year warranty.
Looking at the performance charts and tables, the Seasonic S12G could probably be offering the best all-around performance within its price range. The DC output power quality is excellent and the voltage ripple suppression is remarkable. Since voltage ripple is directly correlated with the longevity of electronic equipment, especially capacitors (it causes self-heating), very low ripple readings benefit the durability of your system's components. The energy conversion efficiency is very high and it maintains its high efficiency and quiet operation even inside a very warm environment.
Its Achilles' heel is that the S12G tends to run a little hot if heavily loaded for prolonged periods of time while inside a very warm environment; however, the only real-world scenario that we can imagine that would replicate such conditions is that of a powerful cryptocoin mining system built inside a poorly designed chassis. If you are planning to use the Seasonic S12G for powering such a system in a $20 case, that probably is a bad idea. However, if you are looking to buy a PSU for its high quality and performance and consider aesthetics and modularity to be secondary or unnecessary features, the Seasonic S12G is definitely worthy of strong consideration.
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tynopik - Saturday, March 1, 2014 - link
> if I short the rectifier bridgeI mean on the component side. Cables can and do short and it should NOT cause permanent harm to the PSU (or to other components on other cables). If it does, the PSU is poorly designed.
> if the distibution grid around your area shifts like "a DJ is rotating the knob", which is not really possible (infinite bus theory)
The request is based off an incident that actually did happen to me. The power dipped 3 times in quick succession and the power supply blew and took out everything connected to it. Granted this was before I knew better and it was a crappy unit running right at its limit, but PSUs do have to deal with power 'variances' in the real world.
E.Fyll - Sunday, March 2, 2014 - link
Shorting a component = OCP protection. I always perform such tests before proceeding to testing the unit. I don't it that to fail catastrophically with $12.000 connected to it...I do understand that this might have had happened to you. It most likely was due to the catastrophic failure of a distribution grid's component. Still, that is not a fault of the PSU, it is an issue with your energy supplier. Your energy supplier is under contract to provide you with electricity of specific quality. If you have such severe problems with your distribution grid, you do not need a better PSU, you need a lawsuit.
HangFire - Monday, March 3, 2014 - link
I'm glad to hear you test OCP. Will you be testing it on all 3 voltage rails?As for voltage variances, they are not typically due to catastrophic failures. Quite mundane failures such as tree and animal shorts happen often, and there is a high voltage protocol to burn them off and resume normal power that sounds just like the poster's experience.
Power in proximity to manufacturing areas can show the effects of large electric motor startup and shutdown. Grids switching in and out contingent power sources can introduce phase issues, and so on.
Blowing all of these off as unusual or the result of large failure is not realistic.
HangFire - Monday, March 3, 2014 - link
Here is a good overview: http://apcdistributors.com/white-papers/Power/WP-1...E.Fyll - Tuesday, March 4, 2014 - link
It is entirely realistic, simply because a) they are unusual and b) are not a problem of the PSU itself but a problem caused by your grid.Large motors and appliances that could cause a voltage drop are not being fed by the consumer distribution grid. Anything above a medium industry is being powered by polyphase distribution. So you being in the same grid as a massive motor, no, it is not going to happen. You are connected on a distribution bus, which is nearly infinite (hence the term "infinite bus") and will no bulge even when huge generators start. If there is an appliance capable of causing a voltage surge or drop connected into the residential grid near you, that is a problem.
Trees and animals are a) not mundane failures and b) definitely not just being "burned off and resume". If an animal shorts two distribution phases and no safety kicks in, the current inbalance will easily destroy a large transformer in milliseconds.
The faults that are being described in APC's white paper certainly are correct and possible. Well, to an extend; after all, it is a paper meant to advertise how good having a UPS is, not really a scientific document. This does not mean that they are frequent, nor that they can be replicated by "rotating the knob". See these ups and downs the waveform does in their examples? Your household grid is doing 50 or 60 of them, depending on where you live, *per second*. The faults rarely have a length of more than a few milliseconds. Rotating a knob 100.000 times per second is definitely not possible, specialized equipment is required to replicate any such test.
HangFire - Friday, March 7, 2014 - link
I'm not the one suggesting the knob methodology.I would have agreed with you when I lived in the suburbs. Since moving to a rural area, I can assure you that brownouts, tree related outages and crossed power lines are quite common here. Besides trees the big threat here is drivers hitting utility poles. Very common this time of year, the combination of ice and hill country is quite hazardous, and many of the poles here carry two sets of voltages. In one event just a few years ago, every lightbulb in my house lit up very bright. I lost 5 lightbulbs and 2 small appliances.
HangFire - Friday, March 7, 2014 - link
I guess MY point is that Active PFC power supplies are supposed to take a range of voltages; but I don't see anyone testing that. I test it every few months, when I get out the 100 foot extension cord and use a PC with 5.1 speaker system for party tunes. (My guests are not picky I guess). I use quality hardware, usually a Seasonic so I'm OK but I wonder what the limits are for the cheaper stuff.tynopik - Saturday, March 1, 2014 - link
I can see where 'component side' could be confusing. I mean 'external to the power supply'. No of course I don't expect you to go digging inside a unit and shorting things out.tynopik - Saturday, March 1, 2014 - link
> the performance of a PSU in situations that will almost never arise should not influence a buying decision.it depends on what you mean by 'almost never' and what the consequences of failure in those cases are.
New Orleans is 'almost never' hit by a hurricane. Does that mean they shouldn't worry it?
Saving a few dollars a year by being more efficient in the usual case is great, but if it blows your system during a random power blip, was it worth it?
CeceliaAFolger - Sunday, March 2, 2014 - link
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