Tom's Hardware Verdict

The Seasonic Prime Titanium 850 is probably the best 850W PSU available on the market today. It features top-notch performance, dead silent operation, nice looks and a hefty 10-year warranty. The only problem is the stiff price, but in this case you get what you pay for.

Pros

+
Full power at 47°C
+
Efficient
+
Ripple suppression
+
Load regulation
+
Hold-up time
+
Silent
+
Build quality
+
Fully modular
+
6x PCIe & 2x EPS connectors
+
Selectable semi-passive operation
+
FDB fan
+
Warranty
+
Looks

Cons

-
Price
-
3.3V rail performance in Advanced Transient Response tests
-
Inrush current with 230V input
-
Distance between peripheral connectors

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Seasonic SSR-850TD Power Supply Review

We already reviewed the Seasonic Prime 650, which impressed us enough to roll out a rare Editor's Choice award. Today we're testing the top member of Seasonic's Titanium Prime family, offering up to 850W of maximum capacity and similar specs as the last model we evaluated. Without a doubt, this company rocked the boat with its high-end Prime series, based on a new platform.

The Prime 850 W Titanium, or SSR-850TD, features compact dimensions and fully modular cabling. In addition to high efficiency and exemplary performance, the PSU also promises quiet operation. There are two fan modes, normal and hybrid, which can be selected through a push-button located on the front panel. As a result of its Titanium-class efficiency, the SSR-850TD doesn't dissipate much waste heat, so there's no reason for an aggressive fan profile or high rotational speed. On top of that, Seasonic finally got over its obsession with 120mm fans and equipped the Prime family with a larger cooler. It is nice to see Seasonic focusing more on quieting down its products; previously, the Snow Silent units were the only ones able to match Super Flower's high-efficiency offerings.

As an aside, we are anticipating the release of new Prime models soon, since this line will consist of more affordable Gold- and Platinum-rated units as well. In addition, we will likely see the Prime platform branded by other companies partnering with Seasonic.

Specifications

Titanium-class efficiency, a single +12V rail, modular cabling, and a 50°C maximum output rating are all highlights of this design. In addition, the SSR-850TD is covered by a full suite of protection features that includes over-temperature protection.

The cooling fan uses a Fluid Dynamic Bearing, which offers a 70,000-hour lifetime at 40°C. In comparison, high-quality double ball-bearing fans are rated for 50,000 hours and sleeve-bearing ones go up to 30,000 hours. There are some FDB fans with much higher ratings, but their manufacturers don't specify a maximum temperature. Seasonic, on the other hand, is crystal clear on the matter. We appreciate when a manufacturer doesn't hide such important details.

Finally, Seasonic guarantees its workmanship for 10 years. The company is clearly gunning for Corsair and EVGA with its extra-long warranty.

Power Specifications

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Rail	3.3V	5V	12V	5VSB	-12V
Max. Power	Amps	20	20	70	3	0.3
Watts	100	840	15	3.6
Total Max. Power (W)	850

The single +12V rail can deliver up to 70A of current, which should be plenty for a high-end gaming system with a couple of flagship graphics cards. On the other hand, the minor rails are limited to 100W combined, though that's still enough for any modern PC. The 5VSB rail is stronger than usual with 15W maximum power output.

Cables And Connectors

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Modular Cables
Description	Cable Count	Connector Count (Total)	Gauge
ATX connector 20+4 pin (610mm)	1	1	18AWG
4+4 pin EPS12V (650mm)	2	2	18AWG
6+2 pin PCIe (675mm+75mm)	3	6	18AWG
SATA (450mm+120mm+120mm+120mm)	2	8	18AWG
SATA (350mm+120mm)	1	2	18AWG
Four-pin Molex (450mm+120mm+120mm)	1	3	18AWG
Four-pin Molex (350mm+120mm)	1	2	18AWG
FDD Adapter (+100mm)	1	1	22AWG

The provided cables are quite long, so you probably won't have problems with full-tower cases. However, we'd like to see more distance between the SATA and peripheral connectors (at least 15cm). We do appreciate the fact that Seasonic provides a set of short SATA and four-pin Molex cables for use in smaller enclosures. And we also like the FDD adapter, since fixed Berg connectors aren't often used these days and they only serve to make cable management harder. Lastly, the number of provided connectors is ample for this unit's capacity; Seasonic gives us access to six PCIe connectors and a couple of EPS ones at the same time.