Verdict:

Cool, quiet and efficient, but not modular.

The memorably named OCZ800EXS-UK belongs to the same EliteXStream series as the equally memorable OCZ1000EXS-UK.

Both PSUs eschew the more common trend of having multiple low-power 12V rails in favour of a single turbocharged 12V rail. In the case of the OCZ800EXS-UK, this is rated at 62A - enough to power all but the most heavily armed PC.

In fact, OCZ has hard-wired in four 6+2-pin PCI-E power cables, so the company expects that you'll be installing the OCZ800EXS-UK in a PC with two graphics cards.

All the other cables are hard-wired in, which helps to cut costs. However, although they're slightly more power-efficient than modular cables, they make it much harder to build a neat and tidy PC. The OCZ800EXS-UK is very compact for an 800W PSU, measuring just 160mm long, and is cooled by a reasonably quiet, temperature-controlled 120mm fan.

The OCZ800EXS-UK was able to output a stable voltage from all its rails, and also proved to be very efficient, averaging 85 per cent at full load. This means that it drew 944W from the mains to produce 800W, which no doubt helps to explain why OCZ can get away with fitting a quiet fan.

Although the OCZ800EXS-UK is compact, quiet, energy-efficient and completely stable, its lack of modular cables makes PC building awkward and annoying compared with the slightly less powerful Cooler Master Silent Pro M700W.

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