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Seasonic FOCUS Plus Series SSR-850FX 850W 80+ Gold ATX12V & EPS12V Full Modular 120mm FDB Fan Compact 140 mm Size Power Supply
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- 10 Years Warranty
- Seasonic Hybrid Silent Fan Control
- 120 mm Fluid Dynamic Bearing (FDB) Fans
- Active Power Factor Correction [up to 99 %]
- Tight Voltage Regulation [± 3 %]
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Seasonic engineers have created a brand new product line based on advanced technology emanating from many years of intensive active research. The result of this development is the solid FOCUS+ Series, which implements modern design and shows outstanding electrical performance. This power supply is small and entirely modular, which will be hard to resist. It is available in 80 PLUS® Platinum and Gold efficiency ratings.
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First off, its a beautiful power supply, this PSU has a thick applied powder coat of matte black paint, that will not scratch. It has a professional, non-flashy finish, that will blend beautifully into whatever build you decide to install this PSU into.
This product is fully modular, allowing the user to install only the power cables he/she needs, and none that they do not. Everything is built onto a single 12V rail, so there will be no concerns for the user regarding load balancing. Additionally, this power supply comes with a 10 year warranty against manufacturing defects, which is industry leading, and shows the confidence that Seasonic places into this product.
Finally, the power supply came with a feature that I have never seen before, and that is a switch that activates the Seasonic Hybrid Silent Fan Control. This switch, when activated, puts the PSU fan into 3 phases: fanless mode, silent mode, and cooling mode. This allows the user to lower noise in their chassis without reducing power delivery. And when this power supply delivers 90% efficiency at 50% load, you'll likely never hear the fan.
This is a fantastic piece of equipment for any modern gaming computer, HTPC, or mining machine. I have purchased numerous Seasonic power supplies in the past, and i continue to be impressed with their product quality. With a 10 year warranty, and a professional, reserved look, its hard not to recommend this series of power supplies to anyone looking to build or update a new system.
The cable layout is like so:
1 x 24-pin motherboard (sheathed)
1 x 4/8-pin CPU (sheathed)
2 x 6/8-pin PCIe (sheathed)
2 x 4 SATA (not sheathed)
1 x 3 molex (not sheathed)
1 x floppy (not sheathed)
This is a fully modular power supply. Modularity means that some or all cables are attached separately so you can pick and choose what you need. This feature becomes more important as wattage goes up so you won't obstruct airflow with unused cables. The cable attachment mechanism is nice and chunky; better than flat inserts that put all four wires in line.
Fifteen years ago, most power supplies were about 70% efficient: for a 100W load, they'd pull about 140W from the wall. Not anymore. We now have six major PSU ratings: 80 Plus and 80 Plus Bronze, Silver, Gold, Platinum, and Titanium. These correspond to half-load efficiencies of 80%, 85%, 88%, 90%, 92%, and 94%. Efficiencies at 1/5 and 4/5 load are about 4% less than half-load. This unit is Gold-rated, and according to PCPer, meets the 90% efficiency requirement for that certification.
There isn't a strong economic argument for efficiency. Relative to a Bronze PSU, the FOCUS saves about $5 a year for a 24/7/365 100W load in most parts of the country. More noticeable is the acoustic difference. Every watt that isn't going into the system needs to be vented from the PSU. Less efficient units require a bigger or faster fan, which makes more noise. The fan in this one doesn't even turn on until a 200W draw and doesn't begin to ramp up until 400W. For the overwhelming majority of systems the overwhelming majority of the time, it'll be completely inaudible.
I haven't commented on ripple and other low-level power characteristics, partly because they're exemplary (par for the course for Seasonic), but also because they're irrelevant. Short of a no-brand $15 tin-box special, just about every PSU on a retail shelf is good enough for a modern system if the wattage is adequate. Computers require less power than they ever have (outside of gaming and overclocking) and motherboard power regulation is better than ever. This FOCUS has no bad behaviors under load, but you could put a $30 Corsair in your system with nary a difference.
This is an excellent PSU for a system with a serious graphics card, and where noise performance and efficiency are at a premium. It's also rather well-priced like the G-series that preceded it. I've had at least four Seasonic power supplies. None have failed. None have had coil whine or strange fan behaviors that I've seen even on high-end models from other brands.
While Seasonic is an OEM for other manufacturers, I believe their own products represent the best they can do. As above, I don't think this level of performance is strictly necessary, but if you're willing to pay for it, you could hardly pick a better PSU. Just run your system by PCPartpicker's excellent power calculator before settling on a wattage.
Well here it is 12 years later and that Seasonic from 2005 is still running strong.
I did a build about 2 years ago and at the time I didn’t need anything with more wattage or features so I used the 12 year old Seasonic (this was the 3rd PC it had been installed in). However, recently I have decided to upgrade my video card and add some more peripherals. I had read announcements that Seasonic was coming out with a new PSU, and since Seasonic has been such a great brand for me and I wanted a modular one, I got the new Seasonic Focus Gold+.
Never having a modular PSU before, it was a bit of a challenge making sure I hooked everything up correctly, but boy is it nice not having all those yellow and red wires everywhere and trying to hide them all. I really like the modular PSU. The only drawback I found is that the instructions were very minimal. I also wish there had been a wire diagram in the instruction book. I just followed how my old PSU was hooked up and everything was fine.
This PSU runs nice and quiet and you can just feel the solidness in the build and the care with the design. Another great product from Seasonic!