Verdict: Very stable, but it's noisy and very expensive

PC Power & Cooling is the only PSU manufacturer based in the USA, and specialises exclusively in high-wattage, heavy-duty models.

This particular model is rated at 510W, with the 3.3V rail rated at 30A and the 5V rail at 40A, but it follows the old ATX spec, as it has only a single 12V rail, which is rated at a meaty 34A.

With its pair of PCI-E connectors, this model was one of the first Nvidia SLI-certified PSUs in the market. It supports both 20- and 24-pin motherboards, and has eight Molex, one FDD and six S-ATA connectors. The interior is cooled by a single temperature-controlled 80mm fan, which varies between silent and very noisy.

The Turbo-Cool lived up to its reputation and passed every voltage stability test with flying colours. However, it isn't a particularly efficient PSU, averaging 72 per cent at full load. This means that it will need to drain 706W from the mains to produce 511W.

While the Turbo-Cool is rock-solid and has a very hefty 12V rail, it does get extremely noisy at full load. At £160, it's also considerably more expensive than more powerful and quieter PSUs.

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