Seasonic PRIME Ultra Titanium 850W (Page 4 of 4) | Reports

Page 4 - Minor Tests and Conclusion

Power supplies are interesting products -- because often, reviews of products in this category are conducted and tested in methods that make it difficult to distinguish one power supply from another. Many aspects must be taken into consideration -- of which certain criteria consists of efficiency, noise, power ripples, and of course the ability to pull out the rated specifications. Because many cannot afford such equipment to obtain results regarding those aspects, articles covering power supplies often come out with less than adequate and acceptable information. As this is a product report -- not a review -- what we are doing is a close examination of the power supply and the internal hardware and build. But what we can do for you is do some minor testing with the results we can present to you with, and let other review sites with professional equipment show you the actual test results. We are not going to try to create useless test results by installing the power supply into the latest gaming rig and try to take readings from that, as this is not even remotely the correct way to test power supply units. We understand that many websites do that as a means of load testing, but the results, even if you use an oscilloscope and multimeter at each output location, it is not sufficient, nor does it accurately reflect the performance of the power supply.


Using our power supply tester which exerts minimal load on the power supply, the initial consumption was 6W as measured by our wall meter unit -- indicating that the basic load-free power consumption of the power supply is excellent. Independent reviews from websites with professional load testing equipment showed the Seasonic PRIME Ultra Titanium 850W delivered industry leading efficiency and matchless voltage regulation and ripple across all rails. This is an 80 Plus Titanium certified power supply unit.

Voltages with minimal load are generally accurate, which is a basic requirement of power supplies out of the box. In this situation all are within 2%. The PG (Power Good) delay seems to be well within its rated range and general power supply standard of 360ms.

Active power correction is important to correct AC load line loss. In AC power, there are three components to it; as there is a phase difference between current and voltage. This makes up the power triangle, which consists of the following: Average usable power (P, measured in watts), reactive power (Q, denoted as VA-R), and total power (S, written as VA). While they all have the save physical units, it is not the same thing as aforementioned. What we want is the average usable power -- with as little wasted reactive power as possible. The total power provided over the AC line is the magnitude of the two combined (sqrt(P^2+Q^2)). Power factor can then be easily calculated by P/S. The ideal value is 1.00, and this is where active PFC comes in. A nominal load of 200W (23.5%) on the Seasonic PRIME Ultra Titanium 850W had the power factor at 0.99. This is excellent as expected.

The Seasonic PRIME Ultra Titanium 850W is silent to very quiet power supply, depending on the amount of power being drawn. Thanks to the slower fan, the Seasonic PRIME Ultra Titanium 850W is even quieter than its non-Ultra counterpart. Under idle level loads (Less than approximately 40%), the PRIME Ultra Titanium is inaudible, because the fan is shut off completely. Under moderate to high loads (Above 40%), the 850W PRIME Ultra Titanium is very reasonably low noise. Personally, I found the Hong Hua HA13525L12F-Z to be excellent, even when spinning at maximum speed. While this is very subjective, I am quite a picky person on noise. On a scale from 0 to 10 where 0 is silent and 10 is the loudest, I would rate the Seasonic PRIME Ultra Titanium 850W to be at 0.0/10 when the fan is off, because, well, the fan is off. Above that, I would peg it at 2.0/10 acoustically under moderate loads, because the fan does not spin that fast. The fan is reasonably quiet even at full speed. If you are a silent PC enthusiast, the Seasonic PRIME Ultra Titanium 850W simply will not disappoint.

Seasonic provided this product to APH Networks for the purpose of evaluation.

The Seasonic PRIME Ultra Titanium 850W, like the PRIME Titanium 850W, continues to be no doubt one of the best, if not the best, power supply in the market today with untouchable performance according to our affiliates with professional load testing equipment. It delivers flawless output and top tier efficiency in a combination that is not matched by the competition at press time. With even lower noise compared to the non-Ultra series when the fan is running, to complete silence where possible in Hybrid Mode, and a whopping twelve-year warranty, the PRIME Ultra Titanium 850W is still the power supply to beat in 2018. For about $200 at press time, there is a price premium to pay for the very best, but you can be assured your money is well-spent in the end.

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Page Index
1. Introduction, Packaging, Specifications
2. Physical Look - Outside
3. Physical Look - Inside
4. Minor Tests and Conclusion