Seasonic X900

The Seasonic X900's (number two in the image) 900W output is considerable overkill unless you're building a real behemoth of a system with multiple graphics cards and multiple physical processors.

Seasonic includes four PCI Express power connectors in case you want to
do just that.

But the real sense behind picking a supply this powerful is that components run more stably and more efficiently when they're running well within their capabilities.

When we tested it at 50% load, the X900 achieved a creditable 86.2% efficiency and warmed up to just 25C.

At maximum load, its efficiency fell to 81.6%.

Naturally, though, you pay for the extra power. £109 isn't pocket money, and on a pence-per-watt calculation it would be an expensive choice even if you needed the full 900W.

Its warranty is short, too, at just one year - which is particularly galling considering that most other manufacturers' power supplies come with three or even five years as standard.

To read the reviews, click one of the links below:
Intro
Akasa PowerPax 400W
Enermax Modu82+ 525W
Gigabyte Odin GT 550W
Corsair HX 620W
Cooler Master Real Power M700 - Recommended
Seasonic X900
FSP Everest 1010
PC Power & Cooling Silencer 750W

Author: Darien Graham-Smith