Top 10 energy efficient desktop PCs

9 Fit-PC Slim
£235
6 watts
This is the smallest computer in this list, both in terms of power consumption and physical size. For £235, you get the Ubuntu flavour of Linux, but you can also pay extra to have Windows installed instead. A modest AMD processor keeps things ticking over, so it'll work best if you're just interested in web browsing and basic desktop applications. It's available to buy direct.