Verdict: Stable and efficient, but only really suitable for older PCs

Unlike the HPU-4K580, the HPU-4M480 isn't a modular PSU, so it doesn't have detachable cables.

However, this helps to cut down on cost and has allowed Hiper to produce a stable 480W PSU for just a few pennies over £50.

Despite having two 12V rails, rated at 18A for 12V1 and 16A for 12V2, the Hiper only has an old-fashioned 20-pin ATX connector, so it isn't suitable for the latest 24-pin motherboards.

There's also no PCI-E power plug, although there are eight Molex, one FDD and two S-ATA connectors. The 3.3V rail is rated at 28A and the 5V rail at 32A. There's only one fan, which is a fixed-speed 120mm model that spins at just 1,500rpm, so it doesn't make much noise.

The Hiper passed all the voltage stability tests, although at 100 per cent load, the 12V2 rail dropped to 11.4V, which is right on the borderline of the ATX spec's requirements. It's also reasonably efficient, averaging 74 per cent at full load. That means it draws 632W from the mains when producing 470W.

While this Hiper lacks modern features, such as a 24-pin ATX connector and PCI-E plugs, it does supply stable power at its rated specification, and is reasonably efficient too. If you're looking to provide an older system with a more stable PSU then it may be worth considering.

• Media PC components - 22nd August 2008
• PSUs - 14th July 2008
• Multi-GPU graphics - 20th June 2008
• CPU water cooling - 17th June 2008
• Hard disks - 20th March 2008
• Audio hardware - 29th February 2008
• Graphics cards - 24th January 2008

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