PRIME Ultra 850 W Titanium

Seasonic’s top-notch design shines through this top-notch power supply technology, where high level components are assembled into an optimal circuit design to guarantee the highest level of electrical performance. The PRIME 850 Titanium achieves 80 PLUS® Titanium certification, where efficiency is 94 % at 50 % load. This leading member of the series boasts an improved DC to DC converter design where pins and a copper plate replace cables to connect the back panel and the PCB for increased efficiency. Fully modular cabling makes this power supplies one of the most versatile high-end choices for PC enthusiasts.

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SKU: SSR-850TR Active PFC F3 Categories: ,

80 PLUS® Titanium

The PRIME Titanium Series achieves the highest level of 80 PLUS® Titanium certification on the market with its 94 % efficiency at 50 % system load.


Cybenetics ETA Efficiency Level A

The top-level Cybenetics rating badge testifies that the PRIME Titanium 850 operates between 91 % and 94 % efficiency at all times, at any load. The power supply achieves above 77 % efficiency on the 5 Vsb rail and it merely consumes less than 0.15 W when the system is idling. (See test report | Learn more about ETA)

AMBDA Noise Level A++

Cybenetics LAMBDA Noise Level A++

The noise output of the power supply is as good as it can be; the PRIME Titanium 850 deserved the LAMBDA Noise Level A++ rating as its noise output stays below 20 dB(A) during operation. (See test report | Learn more about LAMBDA)

Fluid Dynamic Fan Bearing

High performance Fluid Dynamic Bearing (FDB) fans are designed to take advantage of the impact absorbance effects of oil. They are extremely reliable and generate considerably less operating noise and heat than ball bearing fans. The lubrication of the bearing surface reduces friction and vibration and therefore lowers overall power consumption. Due to the effortless, quieter rotations and its robust construction, this reliable fan technology also greatly increases the lifespan of the fan.

How it works

When the fan shaft rotates, high pressure oil drifts along the grooves of the bearing sleeve to generate a thin layer of lubrication between the bearing faces. As the speed increases, so does dynamic oil pressure and the shaft is lifted from the bearing to create smooth, effortless rotations. The herringbone shape of the groves helps to efficiently channel the lubricant and avert leakage.
The following illustration depicts the main characteristics of the FDB fans:


Premium Hybrid Fan Control

Seasonic’s vast experience in designing the most silent and efficient power supplies on the market was translated into the development of Hybrid Mode; a state-of-the-art fan control that enables users to keep the overall fan noise at the lowest possible level.

Power Supply Sound

The Seasonic PRIME Series is designed with very favorable level of acoustics and it uses carefully selected components and innovative circuit design to minimize sound output. Beyond our rigorous internal tests, the power supply also went through external testing with the most popular graphics cards to ensure that the sound at all loads would be kept at the lowest possible level. The chart compares the sound level of the Seasonic PRIME power supply to other ambient sounds.

fab chart

Micro Tolerance Load Regulation

Seasonic’s latest design keeps the output voltage within a very tight range, achieving under 0.5 % load regulation. This impressive electrical performance and stability makes this power supply an ideal choice for high-performance systems.

Extended Hold-up Time (30 ms)

Improved circuit design and high-quality components have greatly increased the hold-up time measured under 100 % load, from an industry standard of 16 ms to above 30 ms. This substantial improvement means that even under unstable input current conditions the power supply will continue to output stable and precise current to ensure smooth operations.

Super Low Ripple Noise (20 mV)

Seasonic’s continued commitment to excellent analog power supply design has suppressed ripple noise to fall well below the current industry average of 20 mV.

Cable-free Connection Design

Seasonic’s engineers have implemented a new design feature, where instead of cables; the back panel and the PCB (Printed Circuit Board) are connected by a copper plate. This breakthrough solution not only lowers the chance of production errors during manual insertion but it also improves output power quality.

12 Years Warranty

Our commitment to superior Seasonic quality.

Specifications are subject to change without prior notice.

Technical Specifications
Form FactorIntel ATX 12 V
Dimensions150 mm (W) x 170 mm (L) x 86 mm (H)
Fan InformationFan Size135 mm
Fan ControlPremium Hybrid Fan Control
Fan BearingFluid Dynamic Bearing
Life Expectancy50,000 hours at 40 °C, 15 % - 65 % RH
Cable InformationModularityFully Modular
Cable typeFlat black cables
Electrical FeaturesOperating Temperature0 - 50 °C
MTBF @ 25 °C, excl. fan150,000 hours
AC InputFull Range
ProtectionOPP, OVP, UVP, OCP, OTP, SCP
Safety and EnvironmentalSafety and EMCcTUVus, TUV, CB, CCC, BSMI, EAC
Environmental ComplianceEnergy Star, RoHS, WEEE, ErP Lot 6, REACH
Warranty12 Years
Power Output
AC InputVoltage: 100 V - 240 V
Current: 11 - 5.5 A
Frequency: 50 Hz - 60 Hz
DC OutputRail+3.3 V+5 V+12 V-12 V+5 VSB
Maximum Power20 A20 A70 A0.3 A3 A
100 W840 W3.6 W15 W
Total continuous power850 W

Specifications are subject to change without prior notice.

ConnectorConnector countCable countCable
Main Power (24/20 pins)11
CPU (8/4 pins)22
PCIe (8/6 pins)66

Specifications are subject to change without prior notice.


Download datasheet

Toms Hardware

November 09, 2016

“The Seasonic Prime 850 is probably the best 850 W PSU available on the market today. It features top-notch performance, dead silent operation, nice looks and a hefty 10-year warranty.”

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October 12, 2016

“Sursa testata astazi are tot ce v-ati putea dori: 10 ani garantie, cea mai inalta eficienta de pe piata (80PLUS Titanium), performanta impecabile cu ripple sub 20mv garantat din fabrica si voltaje stabile, silentiozitate la cel mai inalt nivel datorita functionarii fanless in conditii de utilizare normale, rezerva de putere de 25 si conectivitate full modulara.”

(Read More)

HardOCP | Editor’s Choice

October 03, 2016

“From the PRIME 850Ws outstanding built quality and design, to the voltage regulation that is something so devastating you just dont see things like that done in polite company, to the DC Output Quality that makes your head spin the competition didnt have a chance. It was like someone fielded the New England Patriots against a Pop Warner team.”

(Read More)

Jonny Guru | Gold Award

September 19, 2016

“This is to date the most stable power supply I have ever tested. By far. It gave me beyond mythic regulation to the point I might have to buy a new meter to quantify stability in anything else like it, ripple control was insanely good, and the unit was pushing 95 efficiency at one point.”

(Read More)

PCEKSPERT | Editor’s Choice

September 15, 2016

“PRIME 850 W Titanium je svakako najbolje napajanje koje smo imali prilike ovako detaljno testirati.”

(Read More) | Editor’s Choice

September 12, 2016

“En esta generación Seasonic profundiza en lograr las certificaciones de eficiencia más exigentes, en cumplir y superar los estándares más duros y en ofrecer las potencias y formatos que los usuarios necesitamos. Este modelo, sin duda, es una forma de reivindicarse como el mejor fabricante de fuentes del mercado.”

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Cowcotland | Gold

August 26, 122016

“Avec cette Prime, Seasonic nous propose une alimentation qui est bien faite, qui présente très bien, qui propose une connectique pléthorique, un ventilateur semi-passif toujours silencieux, une partie électrique de premier ordre et une garantie de pas moins de 10 ans. Ce bloc est un vrai haut de gamme et il le fait payer le prix fort, très fort même car ce dernier sera proposé à 260 Euros.”

(Read More)

KitGuru | Must Have

August 18, 2016

“Technically it is difficult to find anything to fault. The Titanium rated power supply excels in load regulation and ripple suppression, hitting a top 2 of units we have tested in the last year. Power delivery is stellar we were able to hold close to a 1000 watt load for an extended period of time without a problem. Over-specifying power delivery has been a Seasonic feature for some time, so it is reassuring to see that this has not changed in 2016.”

(Read More)

PRIME Ultra 850 W Titanium
PRIME Ultra 850 W Titanium
PRIME Ultra 850 W Titanium
PRIME Ultra 850 W Titanium