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Seasonic PRIME 850W Platinum PSU Review

The PRIME box is very eye catching, but it is also very difficult to photograph due to the shiny, reflective surfaces.

The front of the box shows 7+3 years warranty, but its now 7+5 years warranty coverage. You can read about the 12 years warranty (HERE).

The rear of the box is clutter free, with a list of key specifications and a high resolution image of the power supply.

The power supply itself is protected inside a soft felt bag which is wedged between thick slabs of foam for shipping protection.

Seasonic fully load this box with a wealth of extras. You get a modular cable bag, resealable plastic wallet, regional specific power connector, two kinds of cable ties, a case badge, branded sticker, an installation guide, mounting screws and user manual.

The Seasonic power supply is a pure modular design. The cables are a mixture of sleeved (ATX, CPU and PCIe) and flat ribbon style (peripherals), for ease of routing.

Connector Number of Connectors Cable Lengths
Main Power (20/24 pins) 1 1 x 610 mm
CPU (4/8 pins) 2 2 x 650 mm
PCIe (6/8 Pins) 6 3x 675 + 75 mm
SATA 10 2 x 450 + 120 + 120 + 120 mm
1 x 350 +120 mm
Peripheral 5 1 x 450 + 120 + 120 mm
1 x 350 +120 mm
Floppy 1 1 x 101 mm

There are a total of six 6+2 Pin PCIe connectors to support very high end Crossfire and SLi systems (1000w and 1200W units have eight of these connectors available). Seasonic also supply dual 4+4 Pin ATX12V/EPS12V connectors to deliver power to two high end processors. There are a total of 10 SATA connectors available via the 850 watt unit, the 1000w and 1200w units have 12.

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